POLITICO: Sanders heart attack casts cloud over his candidacy. “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. . . . 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.”