Clinton's comments come as Sanders is among the front-runners in the Dem race.

Hillary Clinton would not pledge to support Bernie Sanders if he won the Democratic nomination.

Sen. Bernie Sanders and Sen. Elizabeth Warren are jockeying for support from the progressive wing of the Democratic Party.

A new Des Moines Register poll shows Bernie Sanders in the lead but with three weeks before the caucuses the tight race is still up for grabs.

He faces the challenge of earning a repeat victory in the New Hampshire primary.

Sen. Bernie Sanders is currently in "good health" nearly three months after he suffered a heart attack, doctors wrote in letters released by his campaign.

Sen. Bernie Sanders is currently in "good health" nearly three months after he suffered a heart attack, doctors wrote in letters released by his campaign.

Sen. Bernie Sanders, who ran in 2016 as a Democrat, is one of the most well-known presidential candidates in a field with relatively lower-profile candidates.

FiveThirtyEight's Nate Silver looks into Bernie Sanders' chances of winning the Democratic nomination on "This Week."

The Naval Air Force veteran said he was buried in medical debt at a Bernie Sanders campaign event in September.

A Sen. Bernie Sanders’ presidential campaign hire is no longer with his staff after a series of decade-old vulgar tweets were reported.

Bernie Sanders is promising to invest $150 billion to bring high-speed internet to “every household in America” while breaking up and better regulating monopolies he says currently limit access to drive up their profits

Sanders has remained among the front-runners despite his heart attack.

Sanders leads Elizabeth Warren by 3 points in the key primary state.

Democratic presidential candidate Bernie Sanders is planning to release his health records by the end of the year

Sanders is the oldest candidate in the race, but picked up an endorsement from youngest woman in Congress: Alexandria Ocasio-Cortez.

Sen. Bernie Sanders returned to the campaign trail Saturday with a rally in New York City, supported by Rep. Alexandria Ocasio-Cortez.

Sen. Bernie Sanders' campaign announced Tuesday night that Rep. Alexandria Ocasio-Cortez plans to endorse Sanders' presidential campaign.

With Sen. Elizabeth Warren climbing in polls, Sen. Bernie Sanders highlighted a key difference in their core economic philosophies in an interview on ABC's "This Week."

Campaign surrogate Nina Turner told ABC News' "Powerhouse Politics" hosts that Bernie Sanders will continue campaigning, despite last week's heart attack.

Bernie Sanders got candid about the toll of the campaign trail and admits he should've paid more attention to the signs his body was giving him.

The 2020 Democratic presidential candidate said he was "dumb" for not listening to his body ahead of his heart attack, and vowed to continue on the campaign trail.

The senator made the statement while going for a walk with his wife Jane.

After suffering a heart attack and two stents implanted, Sanders has returned home and says he will be in the next Democratic debate.

It was a struggle to keep up with Sen. Bernie Sanders during the 2016 presidential primary.

The senator was hospitalized after a heart procedure to clear a clogged artery, but his campaign promises he will be on the debate stage in less than two weeks.

Bernie Sanders, hospitalized on Tuesday, had a heart attack, his doctor confirmed.

Jane Sanders deferred to health professionals on his status but said the 78-year-old Democratic presidential candidate “looks more energetic than he has been.”

Presidential candidate Sen. Bernie Sanders underwent emergency heart surgery after he experienced chest pain at a campaign event Tuesday.

Sen. Bernie Sanders, 78, was hospitalized Tuesday night in Las Vegas.

Presidential candidates and politicians have voiced their support for Sen. Bernie Sanders in the wake of his hospitalization.

Speaker Nancy Pelosi says the Vermont senator will have “more energy” after undergoing a cardiac procedure.

Sanders has canceled all upcoming events until further notice as he recovers.

Sen. Bernie Sanders, 78, was hospitalized with chest pain in Las Vegas, Nevada.

Third quarter fundraising roundup: Bernie Sanders raises $25.3 million; Pete Buttigieg raises $19.1 million.

Bernie Sanders unveils "Tax on Extreme Wealth" plan to fund social welfare proposals

The senator delivered remarks at the Comanche Nation Fair in Oklahoma.

Vermont Senator Bernie Sanders appeared on ABC's The View.

Health care was Sanders' focus on second day of campaigning in South Carolina.

In Kentucky, Sanders brands home-state senator and majority leader Mitch McConnell an obstructionist for blocking Democratic efforts to reduce gun violence, bolster election security and raise the minimum wage

The rapper previously expressed her support for "Daddy Bernie's" campaign.

The rapper previously expressed her support for "Daddy Bernie's" campaign.

The Independent has been a U.S. Senator from Vermont since 2007.

Sanders called on fellow Democratic presidential candidates Wednesday to reject donations from health insurance and pharmaceutical companies.

Sen. Bernie Sanders spoke with ABC News Chief Anchor George Stephanopoulos on ABC's "This Week" Sunday.

The presidential hopeful's plan would include all private and graduate school loan debt.

Sen. Bernie Sanders, a leading 2020 Democratic candidate, details his plan to canel $1.6. trillion in student debt for everyone.

Sen. Bernie Sanders made a high-profile defense of Democratic Socialism, a political ideology targeted by both conservative Republicans and moderate Democrats.

Bernie Sanders accuses Trump of running "racist child prisons" for sending migrant children to an Army base once used as an internment camp for Japanese Americans.

Sen. Bernie Sanders spoke on behalf of employees who are lobbying for a seat on the Walmart's board.