An old Beltway joke is that the most dangerous place in Washington is between Chuck Schumer and a TV camera. After Week One of the Trump impeachment trial, that deserves modification: The most dangerous place for Democrats is Chuck Schumer in front of a TV camera.

Speaker Nancy Pelosi handed the impeachment baton to the Senate minority leader, and doesn’t America know it. The New Yorker has engaged in a media sprint, accusing Republicans of a rigged trial. He’s doing a masterful job of unifying Republicans, encouraging them...