MINNEAPOLIS — When Bryan Dahlmeier, a 41-year-old manager of a body shop, first heard that Senator Al Franken was accused of groping a woman, he was willing to extend him some “Minnesota Nice.”

“I thought, he was a comedian, maybe it was taken out of context,” said Mr. Dahlmeier, sipping a beer at a brewery in downtown Minneapolis on Thursday night.

But as the accusations against Mr. Franken piled up, Mr. Dahlmeier, a Democrat who was a fan of Mr. Franken’s books and radio show even before he ran for office, decided that his beloved senator had to go. “It was the right thing to do,” he said. “Things that dudes used to get away with, they can’t get away with any more. It’s too bad, because I would have voted for him again.”

Mr. Franken’s announcement on Thursday that he would resign his seat in the coming weeks left his home state of Minnesota reeling. Residents of a state that has prided itself on clean politics seemed dazed, angry and a little indignant that the latest high-profile sexual harassment scandal roiling the country had landed on their doorstep.