Former mayor of Burlington; elected to the House of Representatives in 1990; elected to the Senate in 2006

Sanders’s signature issues

With an anti-establishment style that has changed little over five decades, Mr. Sanders has attracted a loyal cadre of fans. He often boasts, correctly, that some of his agenda items once considered radical — “Medicare for all,” a $15 minimum wage, tuition-free public college — have now been embraced by many Democrats.

Running for president a second time, he is one of the most-well known candidates in the race. But he remains something of an outsider: A self-described democratic socialist, he has never joined the party he hopes to lead.