Three strong election nights don't erase concerns about a candidate. It was barely a month ago that Biden skipped out on New Hampshire early and wound up finishing fifth in the first-in-the-nation primary state. It's been less than two weeks since he scored his first victory, in South Carolina.

Even on Tuesday, a testy exchange involving Biden and an auto worker in Michigan went viral. That clip was eagerly peddled by the Trump campaign as evidence that Biden is losing his grip.

Still, for a growing number of Democratic voters, it would appear that the race has gone on long enough. At a time of serious concerns and monumental stakes, they've found comfort in Biden -- who is now more comfortable than ever atop the Democratic Party.

The next move belongs to Sanders. The party -- at this moment, and very likely for this election cycle - belongs to Biden.

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