That 15 percent threshold is crucial. Campaigns must reach it in congressional districts to win delegates in them, and there are some warning signs for Biden, who was at only 11 percent in the San Francisco Bay Area, according to the poll. The story of Sanders’s lead in California is centered on young voters. He got 54 percent among those under 29, and about two-fifths of those in their 30s. He was there to stump for Representative Jeff Van Drew, the anti-impeachment Democrat who, you might recall, flipped parties last month and pledged his “undying support” for the president.

Source: New York Times January 29, 2020 12:00 UTC