The party taking shape will challenge the GOP with a distinct populist tilt, marking a departure from the centrist views that had dominated during the era of Bill Clinton and Barack Obama. This year’s candidates have largely endorsed universal health care, a $15 minimum wage, easing the financial burden for college students and tougher gun control.

But there is sharp disagreement as more than 1,100 candidates have filed, with disputes over tactics — how to criticize Trump or how best to talk about issues — and sparring over who should be the standard-bearers, either first-time hopefuls or experienced politicians.

In Kentucky, for example, a female fighter pilot is lashing out at Democratic leaders after they recruited a wealthy mayor for the race against a Republican congressman who has staunchly supported Trump’s agenda.

In Indiana, a liberal attorney talking about censuring the president has stoked a fierce fight over how strident the Democratic resistance should be.