The surge doesn’t seem to be a result of enthusiasm for any one Democratic candidate. Many Democratic voters, after all, spent months undecided about and uninspired by the current field. Instead, turnout appears to have surged because Democrats have rallied around Joe Biden as the candidate most likely to defeat President Trump — and because they remain very energized about beating Trump.

“From the moment he was sworn in back in January, 2017, Donald Trump has been the Democratic Party’s single greatest get out the vote tool,” Joe Walsh, a Republican former congressman who ran a brief primary campaign against the president, wrote last night.

“Joe Biden is not my candidate. But people saying he isn’t electable are lying to themselves,” the author Molly Knight wrote. It is “becoming obvious Biden is way more popular than Hillary. Trump lost to her by 3 million votes and needed an inside straight in the electoral college to beat her.”

Biden has performed well among both the white and black working class, Richard Yeselson of Dissent magazine noted. That pattern suggests that the left’s theory of winning elections is wrong, Yeselson added. (I agree.)

And the turnout surge isn’t limited to loyal Democrats. In Michigan’s Livingston County, a conservative part of the Detroit suburbs, turnout in the Democratic primary soared yesterday. “That surge in turnout, virtually all of it for Biden, includes Republicans and independents voting for him in the Democratic primary — and presumably ready to vote for him in the general” election, said William Kristol, the conservative writer.