Bernie Sanders has been sidelined for nearly a week — after failing for almost three days to disclose that he had a heart attack. It’s unclear when the 78-year-old senator will return to the stump. His campaign has yet to divulge the severity of his heart attack.

And that sequence of events unfolded as he’s been eclipsed in the polls by the other progressive icon in the race, Elizabeth Warren.

Now Sanders and his campaign are laboring to contain the cloud of uncertainty that’s formed over his candidacy. According to interviews with Sanders’ aides and surrogates, they’re betting that his performance at next week’s debate and on the campaign trail will show he still has the stamina to run for and serve as president.

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Sanders’ staffers also plan to emphasize how his health scare demonstrates the need for Medicare for All.

Throughout the Democratic Party, however, insiders and strategists are openly questioning the effect his heart attack would have on his bid for the White House — and on the primary as a whole. Sanders’ team is also coming under fire from some journalists and Democrats for not announcing earlier that he suffered a heart attack. His aides have declined to allow reporters to interview Sanders’ doctors.

Source: Sanders heart attack casts cloud over his candidacy