Nobody doubts a Democratic House can produce 218 votes for impeachment. It probably doesn’t matter much what the charges are. In some sense, that’s where impeachment should land: The charges matter less than whether, under the totality of considerations, a president should be removed before his term ends.

Democrats are still living down previous quotes about the need for a broadly supported impeachment. Nancy Pelosi, for one, likely regarded herself as handcuffed by the Ukraine whistleblower. If Mr. Trump were re-elected and...