What was Dean thinking?

When David Letterman played the video Tuesday night on CBS’s “Late Show,” Dean’s head appeared to explode at the end of the speech. “Did you see Howard Dean ranting and raving?” he asked the audience. “Here’s a little tip, Howard: cut back on the Red Bull.”

On NBC’s “Tonight Show,” host Jay Leno joked: “I’m not an expert in politics, but I think it’s a bad sign when your speech ends with your aides shooting you with a tranquilizer gun.”