So much for high crimes and misdemeanors. Faced with a resolution to impeach President Trump on Wednesday, House Democrats blinked. That was the smart move politically, but what does it say about the courage of their conviction that Mr. Trump is a clear and present danger to the country and Constitution?

The resolution was offered by Texas Rep. Al Green, who has been calling for impeachment almost since Jan. 20, 2017. He used the uproar over Mr. Trump’s Twitter attacks on four House Democratic women to offer his resolution...