Bernie could win the Democratic nomination. But he has to show he can beat Trump.

Nationally, Sanders trails only longtime polling leader Joe Biden, having just crossed the 20 percent threshold in the RealClear Politics average for the first time since last April, while both Elizabeth Warren and Pete Buttigieg have been...

Bernie could win the Democratic nomination. But he has to show he can beat Trump.

Bernie could win the Democratic nomination. But he has to show he can beat Trump.Nationally, Sanders trails only longtime polling leader Joe Biden, having just crossed the 20 percent threshold in the RealClear Politics average for the first time since last April, while both Elizabeth Warren and Pete Buttigieg have been trending downward.