Is Bernie Sanders' window to secure the nomination closing?

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Is Bernie Sanders' Window to Secure the Nomination Closing?

Bernie Sanders promised his supporters a political revolution, but if his campaign can't find its way soon, that promise could go unfulfilled.

The Sanders campaign suffered a setback in Nevada, a loss which underscored the vulnerabilities of the Vermont Senator's chances going forward.

SEE ALSO: Mysterious high-pitched tone keeps Oregon residents up at night

While Sanders' youth-oriented campaign won handily with young voters, Hillary Clinton dominated among voters over 65. And that is a much more reliable demographic to have in your corner.

See the millennials who support Bernie Sanders:

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NTP: Bernie Sanders attracts millennials
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Is Bernie Sanders' window to secure the nomination closing?
IOWA CITY, IOWA-JANUARY 30: Students are ecstatic with Bernie Sanders as he arrives to a big rally at the University of Iowa. (Photo by Lucian Perkins /for The Washington Post via Getty Images)
IOWA CITY, IOWA-JANUARY 30: Bernie Sanders, a Democratic candidate for President of the U.S., attracts a huge crowd a rally at the University of Iowa. (Photo by Lucian Perkins /for The Washington Post via Getty Images)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, center, and his wife Jane Sanders, center right, stand on stage as the song 'This Land is Your Land' is played during a campaign rally at the University of Iowa Field House in Iowa City, Iowa, U.S., on Saturday, Jan. 30, 2016. Hillary Clinton is holding onto a slim lead over Sanders in Iowa as Democrats prepare for Mondays caucuses, though an outpouring of young voters and those who say the system is rigged could enable Sanders to pull off an upset, according to a new poll. Photographer: Andrew Harrer/Bloomberg via Getty Images
DES MOINES, IA - JANUARY 29: Mark Foster of the band Foster the People performs at a concert in support of Democratic presidential candidate Sen. Bernie Sanders (I-VT) on January 29, 2016 in Des Moines, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
Attendees hold up campaign signs as Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, speaks during a campaign rally at the University of Iowa Field House in Iowa City, Iowa, U.S., on Saturday, Jan. 30, 2016. Hillary Clinton is holding onto a slim lead over Sanders in Iowa as Democrats prepare for Mondays caucuses, though an outpouring of young voters and those who say the system is rigged could enable Sanders to pull off an upset, according to a new poll. Photographer: Andrew Harrer/Bloomberg via Getty Images
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, speaks during a campaign rally at the University of Iowa Field House in Iowa City, Iowa, U.S., on Saturday, Jan. 30, 2016. Hillary Clinton is holding onto a slim lead over Sanders in Iowa as Democrats prepare for Mondays caucuses, though an outpouring of young voters and those who say the system is rigged could enable Sanders to pull off an upset, according to a new poll. Photographer: Andrew Harrer/Bloomberg via Getty Images
An attendee holds an illuminated campaign sign for Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, during a campaign rally at the University of Iowa Field House in Iowa City, Iowa, U.S., on Saturday, Jan. 30, 2016. Hillary Clinton is holding onto a slim lead over Sanders in Iowa as Democrats prepare for Mondays caucuses, though an outpouring of young voters and those who say the system is rigged could enable Sanders to pull off an upset, according to a new poll. Photographer: Andrew Harrer/Bloomberg via Getty Images
IOWA CITY, IOWA-JANUARY 30: Bernie Sanders, a Democratic candidate for President of the U.S., attracts a huge crowd a rally at the University of Iowa. (Photo by Lucian Perkins /for The Washington Post via Getty Images)
DES MOINES, IA - JANUARY 29: Andy Fleming and Dave Moore perform at a concert in support of Democratic presidential candidate Sen. Bernie Sanders (I-VT) on January 29, 2016 in Des Moines, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
DES MOINES, IA - JANUARY 29: Audience members attend a concert in support of Democratic presidential candidate Sen. Bernie Sanders (I-VT) on January 29, 2016 in Des Moines, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
DES MOINES, IA - JANUARY 29: Singers Jill Sobule, Kay Hanley, and Michelle Lewis (L-R) concert in support of Democratic presidential candidate Sen. Bernie Sanders (I-VT) on January 29, 2016 in Des Moines, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. (Photo by Brendan Hoffman/Getty Images)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, waves as he arrives to speak during a campaign rally at the University of Iowa Field House in Iowa City, Iowa, U.S., on Saturday, Jan. 30, 2016. Hillary Clinton is holding onto a slim lead over Sanders in Iowa as Democrats prepare for Mondays caucuses, though an outpouring of young voters and those who say the system is rigged could enable Sanders to pull off an upset, according to a new poll. Photographer: Andrew Harrer/Bloomberg via Getty Images
IOWA CITY, IOWA-JANUARY 30: Bernie Sanders, a Democratic candidate for President of the U.S., attracts a huge crowd a rally at the University of Iowa. (Photo by Lucian Perkins /for The Washington Post via Getty Images)
Democratic presidential candidate Bernie Sanders (C) stands with rock band Vampire Weekend's lead singer Ezra Koenig (R) after speaking at the University of Iowa in Iowa City, Iowa, January 30, 2016, ahead of the Iowa Caucus. / AFP / Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Attendees cheer as Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, leaves the stage during a campaign rally at the University of Iowa Field House in Iowa City, Iowa, U.S., on Saturday, Jan. 30, 2016. Hillary Clinton is holding onto a slim lead over Sanders in Iowa as Democrats prepare for Mondays caucuses, though an outpouring of young voters and those who say the system is rigged could enable Sanders to pull off an upset, according to a new poll. Photographer: Andrew Harrer/Bloomberg via Getty Images
Attendees dance to a David Bowie song after a Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, campaign rally at the University of Iowa Field House in Iowa City, Iowa, U.S., on Saturday, Jan. 30, 2016. Hillary Clinton is holding onto a slim lead over Sanders in Iowa as Democrats prepare for Mondays caucuses, though an outpouring of young voters and those who say the system is rigged could enable Sanders to pull off an upset, according to a new poll. Photographer: Andrew Harrer/Bloomberg via Getty Images
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The Washington Post wrote, "Younger voters — who move more often, work weirder hours and aren't in the habit of voting — simply don't vote as much."

Clinton was also able to attract significantly more black voters as well, which bodes well for the former Secretary of State heading into Super Tuesday.

Seven southern states with large black populations are set to vote March 1, and, according to FiveThirtyEight, Sanders has a less than 5 percent chance of winning Arkansas, Georgia, Tennessee, Texas or Virginia.

The anti-establishment Senator has made it a close race thus far, and still has a shot at northern states like Massachusetts and his home state of Vermont.

But Clinton's so-called "firewall" has largely stayed intact and if Sanders can't find a way to break through, his political revolution could be cut short.

See more of Sanders on the campaign trail:

11 PHOTOS
Bernie Sanders on the campaign trail
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Is Bernie Sanders' window to secure the nomination closing?
PHOENIX, AZ - MARCH 15: Democratic presidential candidate Sen. Bernie Sanders (D-VT) speaks to a crowd gathered at the Phoenix Convention Center during a campaign rally on March 15, 2016 in Phoenix, Arizona. Hillary Clinton won the Democratic primary elections in Florida, North Carolina and Ohio, while Missouri and Illinois remain tight races. (Photo by Ralph Freso/Getty Images)
DES MOINES, IA - JANUARY 26: Democratic presidential candidate Sen. Bernie Sanders (I-VT) speaks to the media after holding a campaign event with United Steelworkers Local 310L, on January 26, 2016 in Des Moines, Iowa. Sanders continues his quest to become the Democratic presidential nominee.. (Photo by Joe Raedle/Getty Images)
TOPSHOT - US Senator and Democratic Presidential Candidate Bernie Sanders speaks during a campaign event at the University of Northern Iowa in Cedar Falls, Iowa, January 24, 2016, ahead of the Iowa Caucus. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, participates in the Democratic presidential candidate debate in Charleston, South Carolina, U.S., on Sunday, Jan. 17, 2016. Hours before Sunday's Democratic debate, the two top Democratic contenders held a warm-up bout of sorts in multiple separate appearances on political talk shows, at a time when the polling gap between the pair has narrowed in early-voting states. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
NEW YORK, NY - JANUARY 05: Democratic presidential candidate Sen. Bernie Sanders (I-VT) shakes hands with supporters after outlining his plan to reform the U.S. financial sector on January 5, 2016 in New York City. Sanders is demanding greater financial oversight and greater government action for banks and individuals that break financial laws. (Photo by Andrew Burton/Getty Images)
LEBANON, NH - NOVEMBER 11: Presidential candidate Bernie Sanders (I-VT) marches in the Veterans Day Parade November 11, 2015 in Lebanon, New Hampshire. Sanders goes into the Democrats second debate this weekend still running strong in the polls.(Photo by Darren McCollester/Getty Images)
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, speaks at the Congressional Hispanic Caucus Institute conference in Washington, D.C., U.S., on Wednesday, Oct. 7, 2015. While next Tuesday's first Democratic presidential debate will probably lack the name-calling and sharp jabs of the Republican face-offs, there's still potential for strong disagreements between the party's leading contenders. Photographer: Andrew Harrer/Bloomberg via Getty Images
Democratic Presidential candidate Senator Bernie Sanders speaks about the Workplace Democracy Act on Capitol Hill in Washington, DC on October 6, 2015. AFP PHOTO/JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
US Senator from Vermont and Democratic presidential candidate Bernie Sanders addresses striking low-wage contract workers from the US Capitol and religious leaders at the Lutheran Church of the Reformation in Washington, DC, on September 22, 2015 for an interfaith service ahead of the arrival of Pope Francis for a six-day visit to the US. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
MANCHESTER, NH - SEPTEMBER 19: Democratic Presidential candidate Senator Bernie Sanders (I-VT) talks on stage during the New Hampshire Democratic Party State Convention on September 19, 2015 in Manchester, New Hampshire. Five Democratic presidential candidates are all expected to address the crowd inside the Verizon Wireless Arena. (Photo by Scott Eisen/Getty Images)
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