New Yorker: Glenn Beck Tries Out Decency.

Beck was mesmerized. On his radio program that day, he heralded Obama’s remarks as “the most effective political speech I have heard since Ronald Reagan.”

Sometimes this kind of sea-change is a game; a way to onboard new audience, and then gradually turn them. Seen it before, during the runup to Afghanistan, Iraq, etc. Speaking from long experience. So don't take this change to heart - yet.