Barring some extraordinary finding, the Senate will likely acquit President Trump handily. That is, if he stops getting in his own way.

In the latest unforced error dragging a relatively predictable impeachment trial back into the news cycle, Trump tacked on Ken Starr and Alan Dershowitz to his defense team. The notion of champion of the Clinton impeachment now defending Trump is ironic, to say the least. But having Dershowitz do so is deeply, deeply detrimental to Trump’s public defense.