Carleton College political analyst Steven Schier says Democrat Bernie Sanders’ heart procedure for a blocked artery could have effects beyond a “serious setback” for his campaign:

“May give some Democrats pause about nominating any older candidate.   And so the obvious problem there is for Joe Biden, who is also in his late 70s, like Bernie Sanders.”

Minnesota Senator Amy Klobuchar is among moderates challenging Biden for the presidential nomination, but polls this week show her in the bottom half of a crowded Democratic field. Sanders has faced a mounting challenge from fellow Democratic liberal Elizabeth Warren.