Bernie Sanders' unconventional health care plan is getting backing from a lot of big-name Democrats

Bernie Sanders is getting some serious support in his push to reform the U.S. healthcare system.

Sanders on Wednesday will roll out a Medicare-for-all bill, which aims to extend the Medicare program, federally funded insurance for people over the age of 65, to all Americans.

A single-payer health care push has previously been well outside the mainstream for most Democrats. But Sanders' legislation has picked up support from high-profile Democrats.

Sen. Cory Booker of New Jersey on Monday became the latest to offer support for Sanders' legislation.

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Former Democratic U.S. presidential candidate Senator Bernie Sanders hugs his wife Jane after making a motion to suspend the rules and nominate Hillary Clinton as the Demcoratic presidential nominee at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 26, 2016. REUTERS/Carlos Barria
U.S. Democratic presidential candidate Bernie Sanders gets a kiss from his wife Jane as he addresses supporters following the closing of the polls in the California presidential primary in Santa Monica, California, U.S., June 7, 2016. REUTERS/Lucy Nicholson
U.S. Democratic presidential candidate Bernie Sanders and his wife Jane wave to the audience during a rally in Vallejo, California, May 18, 2016. REUTERS/Stephen Lam
PORTSMOUTH, NH - With Jane Sanders, Democratic Presumptive Nominee for President former Secretary of State Hillary Clinton attends a rally with Senator Bernie Sanders (I-VT) at Portsmouth High School Gymnasium in Portsmouth, New Hampshire on Tuesday, July 12, 2016. (Photo by Melina Mara/The Washington Post via Getty Images)
Jane O'Meara Sanders walks on the floor during the third day of the Democratic National Convention at the Wells Fargo Center, July 27, 2016 in Philadelphia, Pennsylvania. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
Democratic U.S. presidential candidate Bernie Sanders kisses his wife, Jane O'Meara Sanders, at a rally in Hollywood, Los Angeles, California, United States October 14, 2015. REUTERS/Lucy Nicholson
U.S. Democratic presidential candidate Bernie Sanders (C) hugs his wife Jane Sanders (L) while actress Susan Sarandon surveys the overflow room at a campaign rally in Fairfield, Iowa January 28, 2016. REUTERS/Mark Kauzlarich
U.S. Democratic presidential candidate Bernie Sanders' wife Jane (R) waves to the crowd as Sanders acknowledges her and his step daughters Carina (L) and Heather (C) as Sanders addresses his final campaign rally before the Iowa Caucus at Grand View University in Des Moines, Iowa January 31, 2016. REUTERS/Jim Bourg
Jane Sanders, wife of Vermont Senator and 2016 Democratic presidential candidate Bernie Sanders, listens during an interview following a campaign event in Fort Madison, Iowa, U.S., on Friday, Jan. 29, 2016. In advance of Monday's Iowa caucuses, the first electoral contest of the presidential primaries, Jane Sanders has ventured out often on her own, sometimes with multiple events the same day. Photographer: T.J. Kirkpatrick/Bloomberg via Getty Images
Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, walks with his wife Jane Sanders ahead of the Jefferson-Jackson Dinner in Des Moines, Iowa, U.S., on Saturday, Oct. 24, 2015. With Vice President Joe Biden officially out of the presidential race, the nation's first nominating contest between front-runner Hillary Clinton and Sanders is gaining steam, according to a new Bloomberg Politics/Des Moines Register Iowa Poll. Photographer: Daniel Acker/Bloomberg via Getty Images
FLORENCE, SOUTH CAROLINA - SEPTEMBER 12: With his wife Jane O'Meara, Vermont Senator Bernie Sanders (I-VT) prepares to speak at a Florence Town Hall Meeting in an arena in Florence, South Carolina on Saturday September 12, 2015. (Photo by Melina Mara/The Washington Post via Getty Images)

"I'm signing onto Medicare-for-all, which I'm excited to do this week," Booker said in an interview with NJTV. "Sen. Sanders, myself, and some others are going to be announcing some legislation this week along with some of my other colleagues."

Booker, who has been floated as a possible contender for the Democratic presidential nomination in 2020, said Obamacare was just a "first step" in securing health care for all Americans.

"What we have right now is a country where just because of your wealth, it will depend on whether you have healthcare or not," Booker continued. "You should not be punished because you are working-class or poor and be denied health care. I think healthcare should be a right to all."

Booker's announcement comes after other high-profile Democrats said they would co-sponsor the bill.

Sen. Kamala Harris, who also has been floated as a 2020 contender, said at a town hall late last month that she would also co-sponsor the bill.

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"This is about understanding, again, that healthcare should be a right, not a privilege. And it's also about being smart," Harris said.

Sen. Elizabeth Warren, another senator popular with the progressive wing of the Democratic Party, announced her support on Thursday in an email to supporters.

"I believe it’s time to take a step back and ask: what is the best way to deliver high quality, low cost health care to all Americans?" Warren wrote. "Everything should be on the table — and that’s why I’m co-sponsoring Bernie Sanders’ Medicare for All bill that will be introduced later this month."

The movement on Sanders bill comes as single-payer healthcare has become much more popular among the American public in polling. Even business titans like Warren Buffett have backed the idea.

The bill still faces almost impossible odds of passage, given that Republicans control Congress and the White House. But Sanders' move signals it will be a policy fight Democrats are willing to pick for the foreseeable future.

Sanders, along with the co-sponsors, will roll out the legislation at a large event featuring doctors, hospital workers, and more on Wednesday.

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