What would happen if Biden decided to leave the race?

Joe Biden’s spotty debate performance immediately triggered new questions from worried Democrats about whether he would leave the presidential race.

It would not be an easy process since Biden is already the Democrats’ presumptive nominee and the overwhelming choice of primary voters. He faced little opposition during the primary season, and the fact that he won nearly all of the party’s delegates means it’s very unlikely he’d be forced out of the race against his will.

“This isn’t the ’60s. Voters choose the nominee. He is the nominee,” said CNN analyst and Democratic strategist...