Klein: This harsh political dilemma isn’t all Joe Biden’s fault

On Thursday night, after the first presidential debate, MSNBC’s Alex Wagner interviewed Gov. Gavin Newsom of California. “You were out there getting a chorus of questions about whether Biden should step down,” she said. “There is a panic that has set in.”

Newsom’s reply was dismissive. “We gotta have the back of this president,” he said. “You don’t turn your back because of one performance. What kind of party does that?”

Perhaps a party that wants to win? Or a party that wants to...