DES MOINES, Iowa — Bernie Sanders’ heart attack could have cut his presidential bid short.

Instead, it was the start of a surge of momentum that’s still going strong six weeks later.

Since he was rushed to a Las Vegas hospital in early October, the Vermont senator has flourished in early-state polls, held some of the biggest rallies of any Democratic candidate, and scored the endorsements of Alexandria Ocasio-Cortez and other members of the so-called “Squad.” The curmudgeonly candidate looks happier — sunny, even — on the stump, cracking jokes and sharing personal stories.

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