Bernie Sanders says he's moving ahead with his Dem campaign

BURLINGTON, Vt. (AP) — Bernie Sanders says he's moving ahead with his Democratic presidential campaign.

He told reporters in Burlington on Wednesday that he's not quitting despite key primary losses to Joe Biden the night before. The Vermont senator's path to the presidential nomination considerably narrowed after decisive losses to Biden in Michigan, Missouri and Mississippi.

Sanders acknowledged “we are losing the debate over electability" to a candidate many Democrats think will have a better chance of defeating President Donald Trump in the fall. But he said he wants to force Biden to confront issues of economic inequality and other issues important to Sanders' supporters. 

RELATED: A look at Bernie Sanders' 2020 presidential run: 

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Democratic presidential hopeful Vermont Senator Bernie Sanders speaks during a Get Out to Caucus Rally at Springs Preserve Amphitheater in Las Vegas, Nevada, on February 21, 2020. (Photo by Frederic J. BROWN / AFP) (Photo by FREDERIC J. BROWN/AFP via Getty Images)
AUSTIN, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) and his wife Jane Sanders wave to the crowd at the end of a campaign rally at Vic Mathias Shores Park on February 23, 2020 in Austin, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
AUSTIN, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a campaign rally at Vic Mathias Shores Park on February 23, 2020 in Austin, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
AUSTIN, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a campaign rally at Vic Mathias Shores Park on February 23, 2020 in Austin, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
AUSTIN, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) and his wife Jane Sanders arrive onstage for a campaign rally at Vic Mathias Shores Park on February 23, 2020 in Austin, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
Supporters of Democratic presidential hopeful Vermont Senator Bernie Sanders cheer during a rally at Houston University in Houston, Texas on February 23, 2020. (Photo by Mark Felix / AFP) (Photo by MARK FELIX/AFP via Getty Images)
AUSTIN, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a campaign rally at Vic Mathias Shores Park on February 23, 2020 in Austin, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
AUSTIN, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a campaign rally at Vic Mathias Shores Park on February 23, 2020 in Austin, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
AUSTIN, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a campaign rally at Vic Mathias Shores Park on February 23, 2020 in Austin, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
AUSTIN, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) waves as he arrives onstage for a campaign rally at Vic Mathias Shores Park on February 23, 2020 in Austin, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders speaks during a rally at Houston University in Houston, Texas on February 23, 2020. (Photo by Mark Felix / AFP) (Photo by MARK FELIX/AFP via Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders and his wife Jane O'Meara Sanders arrive on stage during a rally at Houston University in Houston, Texas on February 23, 2020. (Photo by Mark Felix / AFP) (Photo by MARK FELIX/AFP via Getty Images)
TOPSHOT - Democratic presidential hopeful Vermont Senator Bernie Sanders speaks during a rally at Houston University in Houston, Texas on February 23, 2020. (Photo by Mark Felix / AFP) (Photo by MARK FELIX/AFP via Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders speaks during a rally at Houston University in Houston, Texas on February 23, 2020. (Photo by Mark Felix / AFP) (Photo by MARK FELIX/AFP via Getty Images)
Supporters of Democratic presidential hopeful Vermont Senator Bernie Sanders cheer during a rally at Houston University in Houston, Texas on February 23, 2020. (Photo by Mark Felix / AFP) (Photo by MARK FELIX/AFP via Getty Images)
HOUSTON, TX - FEBRUARY 23: (L-R) Democratic presidential candidate Sen. Bernie Sanders (I-VT) and his wife Jane Sanders wave at the end of a campaign rally at the University of Houston on February 23, 2020 in Houston, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
HOUSTON, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a campaign rally at the University of Houston on February 23, 2020 in Houston, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
HOUSTON, TX - FEBRUARY 23: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a campaign rally at the University of Houston on February 23, 2020 in Houston, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
Supporters of Democratic presidential hopeful Vermont Senator Bernie Sanders cheer during a rally at Houston University in Houston, Texas on February 23, 2020. (Photo by Mark Felix / AFP) (Photo by MARK FELIX/AFP via Getty Images)
Supporters of Democratic presidential hopeful Vermont Senator Bernie Sanders cheer during a rally at Houston University in Houston, Texas on February 23, 2020. (Photo by Mark Felix / AFP) (Photo by MARK FELIX/AFP via Getty Images)
SAN ANTONIO, TX - FEBRUARY 22: Democratic presidential candidate Sen. Bernie Sanders (I-VT) and his wife Jane Sanders wave as they exit the stage after winning the Nevada caucuses during a campaign rally at Cowboys Dancehall on February 22, 2020 in San Antonio, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states. (Photo by Drew Angerer/Getty Images)
SAN ANTONIO, TX - FEBRUARY 22: Democratic presidential candidate Sen. Bernie Sanders (I-VT) and his wife Jane Sanders wave as they exit the stage after winning the Nevada caucuses during a campaign rally at Cowboys Dancehall on February 22, 2020 in San Antonio, Texas. With early voting underway in Texas, Sanders is holding four rallies in the delegate-rich state this weekend before traveling on to South Carolina. Texas holds their primary on Super Tuesday March 3rd, along with over a dozen other states (Photo by Drew Angerer/Getty Images)
Supporters of Democratic presidential hopeful Vermont Senator Bernie Sanders cheer during a rally at the Abraham Chavez Theater on February 22, 2020 in El Paso, Texas. - Leftist Bernie Sanders took an early lead on February 22 in Nevada's caucuses, the third nominating contest for Democrats in their high-stakes process to see who will challenge Republican Donald Trump in November's presidential election. (Photo by Paul Ratje / AFP) (Photo by PAUL RATJE/AFP via Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders gestures as he speaks during a rally at the Abraham Chavez Theater on February 22, 2020 in El Paso, Texas. - Leftist Bernie Sanders took an early lead on February 22 in Nevada's caucuses, the third nominating contest for Democrats in their high-stakes process to see who will challenge Republican Donald Trump in November's presidential election. (Photo by Paul Ratje / AFP) (Photo by PAUL RATJE/AFP via Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders gestures as he speaks during a rally at the Abraham Chavez Theater on February 22, 2020 in El Paso, Texas. - Leftist Bernie Sanders took an early lead on February 22 in Nevada's caucuses, the third nominating contest for Democrats in their high-stakes process to see who will challenge Republican Donald Trump in November's presidential election. (Photo by Paul Ratje / AFP) (Photo by PAUL RATJE/AFP via Getty Images)
Olivia Thomas holds a sign inside the Abraham Chavez Theater ahead of a rally for Democratic presidential hopeful Vermont Senator Bernie Sanders on February 22, 2020 in El Paso, Texas. - Leftist Bernie Sanders took an early lead on February 22 in Nevada's caucuses, the third nominating contest for Democrats in their high-stakes process to see who will challenge Republican Donald Trump in November's presidential election. (Photo by Paul Ratje / AFP) (Photo by PAUL RATJE/AFP via Getty Images)
EL PASO, TX - FEBRUARY 22: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a campaign rally on February 22, 2020 in El Paso, Texas. With less than two weeks before Super Tuesday, Sen. Sanders is spending the weekend campaigning in Texas. (Photo by Cengiz Yar/Getty Images)
EL PASO, TX - FEBRUARY 22: People scream ahead of democratic presidential candidate Sen. Bernie Sanders (I-VT) taking the stage at a campaign rally on February 22, 2020 in El Paso, Texas. With less than two weeks before Super Tuesday, Sen. Sanders is spending the weekend campaigning in Texas. (Photo by Cengiz Yar/Getty Images)
EL PASO, TX - FEBRUARY 22: A woman holds a sign for Democratic presidential candidate Sen. Bernie Sanders (I-VT) at a campaign rally on February 22, 2020 in El Paso, Texas. With less than two weeks before Super Tuesday, Sen. Sanders is spending the weekend campaigning in Texas. (Photo by Cengiz Yar/Getty Images)
SANTA ANA, UNITED STATES - FEBRUARY 21, 2020: Supporters of Democratic presidential candidate Sen. Bernie Sanders during a campaign rally in Santa Ana, California. Sanders is campaigning ahead of Super Tuesday and the California Democratic primary.- PHOTOGRAPH BY Ronen Tivony / Echoes Wire/ Barcroft Studios / Future Publishing (Photo credit should read Ronen Tivony / Echoes Wire/Barcroft Media via Getty Images)
SANTA ANA, UNITED STATES - FEBRUARY 21, 2020: Democratic presidential candidate Sen. Bernie Sanders speaks during a campaign rally in Santa Ana, California. Sanders is campaigning ahead of Super Tuesday and the California Democratic primary.- PHOTOGRAPH BY Ronen Tivony / Echoes Wire/ Barcroft Studios / Future Publishing (Photo credit should read Ronen Tivony / Echoes Wire/Barcroft Media via Getty Images)
Supporters hold Bernie placards as Democratic presidential hopeful Vermont Senator Bernie Sanders speaks during a Get Out to Caucus Rally at Springs Preserve Amphitheater in Las Vegas, Nevada, on February 21, 2020. (Photo by Frederic J. Brown / AFP) (Photo by FREDERIC J. BROWN/AFP via Getty Images)
LAS VEGAS, NEVADA - FEBRUARY 21: Democratic presidential candidate Sen. Bernie Sanders (I-VT) waves to supporters at a campaign rally for Sanders on February 21, 2020 in Las Vegas, Nevada. The upcoming Nevada Democratic presidential caucus will be held February 22. (Photo by Mario Tama/Getty Images)
LAS VEGAS, NEVADA - FEBRUARY 21: Supporters of Democratic presidential candidate Sen. Bernie Sanders (I-VT) hold a 'Bernie' sign at a campaign rally for Sanders on February 21, 2020 in Las Vegas, Nevada. The upcoming Nevada Democratic presidential caucus will be held February 22. (Photo by Mario Tama/Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders speaks during a Get Out to Caucus Rally at Springs Preserve Amphitheater in Las Vegas, Nevada, on February 21, 2020. (Photo by FREDERIC J. BROWN / AFP) (Photo by FREDERIC J. BROWN/AFP via Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders greets supporters during a rally at Valley High School in Santa Ana, California, February 21, 2020. (Photo by RINGO CHIU / AFP) (Photo by RINGO CHIU/AFP via Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders addresses a rally at Valley High School in Santa Ana, California, February 21, 2020. (Photo by RINGO CHIU / AFP) (Photo by RINGO CHIU/AFP via Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders gestures as he speaks during a rally at Valley High School in Santa Ana, California, February 21, 2020. (Photo by RINGO CHIU / AFP) (Photo by RINGO CHIU/AFP via Getty Images)
Democratic presidential candidate Bernie Sanders speaks at a press conference prior to a rally at Valley High School in Santa Ana, California, February 21, 2020 (Photo by RINGO CHIU / AFP) (Photo by RINGO CHIU/AFP via Getty Images)
Supporters gather during a rally for US Democratic presidential candidate Bernie Sanders in Valley High School, Santa Ana, California, February 21, 2020. (Photo by RINGO CHIU / AFP) (Photo by RINGO CHIU/AFP via Getty Images)
Supporters gather during a rally for US Democratic presidential candidate Bernie Sanders in Valley High School, Santa Ana, California, February 21, 2020. (Photo by RINGO CHIU / AFP) (Photo by RINGO CHIU/AFP via Getty Images)
Democratic presidential candidate Bernie Sanders speaks at a press conference prior to a rally at Valley High School in Santa Ana, California, February 21, 2020 (Photo by RINGO CHIU / AFP) (Photo by RINGO CHIU/AFP via Getty Images)
Democratic presidential hopefuls Vermont Senator Bernie Sanders (L) and Former Vice President Joe Biden (R) participate in the ninth Democratic primary debate of the 2020 presidential campaign season co-hosted by NBC News, MSNBC, Noticias Telemundo and The Nevada Independent at the Paris Theater in Las Vegas, Nevada, on February 19, 2020. (Photo by Mark RALSTON / AFP) (Photo by MARK RALSTON/AFP via Getty Images)
Democratic presidential hopefuls Massachusetts Senator Elizabeth Warren and Vermont Senator Bernie Sanders speak during a break in the ninth Democratic primary debate of the 2020 presidential campaign season co-hosted by NBC News, MSNBC, Noticias Telemundo and The Nevada Independent at the Paris Theater in Las Vegas, Nevada, on February 19, 2020. (Photo by Mark RALSTON / AFP) (Photo by MARK RALSTON/AFP via Getty Images)
LAS VEGAS, NEVADA - FEBRUARY 19: Democratic presidential candidate Sen. Bernie Sanders (I-VT) smiles during the Democratic presidential primary debate at Paris Las Vegas on February 19, 2020 in Las Vegas, Nevada. Six candidates qualified for the third Democratic presidential primary debate of 2020, which comes just days before the Nevada caucuses on February 22. (Photo by Mario Tama/Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders gestures during the ninth Democratic primary debate of the 2020 presidential campaign season co-hosted by NBC News, MSNBC, Noticias Telemundo and The Nevada Independent at the Paris Theater in Las Vegas, Nevada, on February 19, 2020. (Photo by Mark RALSTON / AFP) (Photo by MARK RALSTON/AFP via Getty Images)
UNITED STATES - FEBRUARY 18: Democratic presidential candidate Bernie Sanders, I-Vt., speaks at a rally at University of Nevada, Las Vegas on Tuesday, Feb. 18, 2020. (Photo by Caroline Brehman/CQ-Roll Call, Inc via Getty Images)
LAS VEGAS, NEVADA - FEBRUARY 18: Democratic presidential candidate Sen. Bernie Sanders (I-VT) and his wife Jane Sanders participate in a march after a campaign rally at University of Nevada February 18, 2020 in Las Vegas, Nevada. Sen. Sanders continues to campaign ahead of the upcoming Nevada Democratic presidential caucus on February 22. (Photo by Alex Wong/Getty Images)
RICHMOND, CALIFORNIA - FEBRUARY 17: Democratic presidential candidate Sen. Bernie Sanders (I-VT) greets attendees during a campaign event on February 17, 2020 in Richmond, California. Bernie Sanders is campaigning in California ahead of the state's Democratic presidential primary on March 3rd. (Photo by Justin Sullivan/Getty Images)
Supporters of Democratic presidential candidate Vermont Senator Bernie Sanders cheer during his campaign rally in Denver, Colorado on February 16, 2020. (Photo by Jason Connolly / AFP) (Photo by JASON CONNOLLY/AFP via Getty Images)
LAS VEGAS, NEVADA - FEBRUARY 15: Joined by members of Make the Road Action and his supporters, Democratic presidential candidate Sen. Bernie Sanders (I-VT), participates in a “March to the Polls” February 15, 2020 in Las Vegas, Nevada. Sen. Sanders continues to campaign for the upcoming Nevada Democratic presidential caucus. (Photo by Alex Wong/Getty Images)
LAS VEGAS, NEVADA - FEBRUARY 15: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks during a “Get Out the Early Vote Rally” at Desert Pines High School February 15, 2020 in Las Vegas, Nevada. Sen. Sanders continues to campaign for the upcoming Nevada Democratic presidential caucus. (Photo by Alex Wong/Getty Images)
DENVER, CO - FEBRUARY 16: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to a large crowd of supporters at a rally in the Colorado Convention Center on February 16, 2020 in Denver, Colorado. (Photo by Marc Piscotty/Getty Images)
DENVER, CO - FEBRUARY 16: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to a large crowd of supporters at a rally in the Colorado Convention Center on February 16, 2020 in Denver, Colorado. (Photo by Marc Piscotty/Getty Images)
DENVER, CO - FEBRUARY 16: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to a large crowd of supporters at a rally in the Colorado Convention Center on February 16, 2020 in Denver, Colorado. (Photo by Marc Piscotty/Getty Images)
DENVER, CO - FEBRUARY 16: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to a large crowd of supporters at a rally in the Colorado Convention Center on February 16, 2020 in Denver, Colorado. (Photo by Marc Piscotty/Getty Images)
MANCHESTER, NH - FEBRUARY 11: Senator Bernie Sanders stops to take a selfie with a supporter at his Primary Night Rally in Manchester, NH on Feb. 11, 2020. Bernie Sanders claimed victory in the first-of-the-nation primary in New Hampshire. (Photo by Jessica Rinaldi/The Boston Globe via Getty Images)
MANCHESTER, NEW HAMPSHIRE - FEBRUARY 11: Supporters cheer as results start to show on the screen ahead of Sen. Bernie Sanders, I-Vt., 2020 Democratic Presidential Candidate, Primary Night Celebration at SNHU Field House on Tuesday, February 11, 2020 in Manchester, New Hampshire. (Photo by Salwan Georges/The Washington Post via Getty Images)
MANCHESTER, NEW HAMPSHIRE - FEBRUARY 11: Jan Schaffer, of Warrner, NH, watches as results started to show on the screen ahead of Sen. Bernie Sanders, I-Vt., 2020 Democratic Presidential Candidate, Primary Night Celebration at SNHU Field House on Tuesday, February 11, 2020 in Manchester, New Hampshire. (Photo by Salwan Georges/The Washington Post via Getty Images)
MANCHESTER, NEW HAMPSHIRE - FEBRUARY 11: Supporters cheer as results start to show on the screen ahead of Sen. Bernie Sanders, I-Vt., 2020 Democratic Presidential Candidate, Primary Night Celebration at SNHU Field House on Tuesday, February 11, 2020 in Manchester, New Hampshire. (Photo by Salwan Georges/The Washington Post via Getty Images)
MANCHESTER, NEW HAMPSHIRE - FEBRUARY 11: Supporters cheer as results start to show on the screen ahead of Sen. Bernie Sanders, I-Vt., 2020 Democratic Presidential Candidate, Primary Night Celebration at SNHU Field House on Tuesday, February 11, 2020 in Manchester, New Hampshire. (Photo by Salwan Georges/The Washington Post via Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders stands with wife Jane O'Meara Sanders at a Primary Night event at the SNHU Field House in Manchester, New Hampshire on February 11, 2020. - Bernie Sanders won New Hampshire's crucial Democratic primary, beating moderate rivals Pete Buttigieg and Amy Klobuchar in the race to challenge President Donald Trump for the White House, US networks projected. (Photo by TIMOTHY A. CLARY / AFP) (Photo by TIMOTHY A. CLARY/AFP via Getty Images)
Democratic presidential hopeful Vermont Senator Bernie Sanders speaks at a Primary Night event at the SNHU Field House in Manchester, New Hampshire on February 11, 2020. - Bernie Sanders won New Hampshire's crucial Democratic primary, beating moderate rivals Pete Buttigieg and Amy Klobuchar in the race to challenge President Donald Trump for the White House, US networks projected. (Photo by TIMOTHY A. CLARY / AFP) (Photo by TIMOTHY A. CLARY/AFP via Getty Images)
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He said he was planning to do that in the debate scheduled with Biden on Sunday.

Sanders did not address supporters publicly Tuesday night. Pressure has been growing on him to end his presidential bid and work to unify the party against Trump.

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