Democrats, especially in the House, say tolerance is breaking down along party lines — and their party is far less tolerant.

“We can’t have a double standard,” said Representative Debbie Dingell, Democrat of Michigan, referring to Mr. Farenthold. “He settled for $84,000; it’s a lot of money, that’s not for nothing. I think he should step down according to the same standards that Nancy Pelosi and Paul Ryan set for John Conyers.”

Polls have shown that Democrats are far more critical of sexual harassment within their own ranks than Republicans are of harassment within theirs. Only 40 percent of Republicans who participated in a recent HuffPost/YouGov poll thought sexual harassment was a very or somewhat serious problem within their party, while 60 percent of Democrats said it was a problem among themselves.