Harry Reid has done as much as anyone to pave the way for Donald Trump’s victory by promoting Washington dysfunction, so it’s no surprise that he has reacted to the election result by proving the point one more time.

The soon-to-be-former Democratic Senate leader issued a statement Friday that showed his contempt for anyone who voted for Mr. Trump. “I have personally been on the ballot in Nevada for 26 elections and I have never seen anything like the reaction to the election completed last Tuesday. The election of Donald...