Resurgent Trump Has Democrats in Swing Districts Despondent

Adam Frisch, a Democrat trying to flip a Republican House seat in Colorado, was frustrated enough that calls for President Biden to step aside — including his own — were having little impact on the president.

Then reports came Tuesday that leaders of the Democratic National Committee were moving to confirm Mr. Biden as his party’s presidential nominee by the end of July and his anger boiled over.

“It’s so frustrating, to Democratic voters, to donors, to the double haters who don’t like Biden or Trump,” Mr. Frisch said in an interview on Tuesday. “This is why people hate politics. It looks like the books are being cooked.”

The debate over whether Mr. Biden should be the Democratic nominee has alternately simmered and boiled since his disastrous debate performance late last month. Now the party is seeking to rapidly bring that conversation to a close with a virtual roll call of state delegates in July that would make Mr. Biden and Vice President Kamala Harris the official nominees.

Jaime Harrison, the Democratic National Committee chairman, said it was “false” that a long-planned virtual roll call was being accelerated, but having it this month — rather than waiting until the August convention — has drawn growing opposition.

The nomination would come just after an extraordinary series of events: a failed attempt on former President Donald J. Trump’s life; bipartisan calls to lower the temperature of the country’s politics and tone down the rhetoric, including on Democratic warnings of the dangers of a second Trump administration; a series of legal victories for Mr. Trump that postponed his sentencing on 34 felony convictions, tossed out indictments over classified documents taken from the White House and jeopardized the federal