First Lady hopeful Michelle Obama appeared last night on Stephen Colbert's "The Colbert Report", which is filming from Philadelphia this week.

It was Obama's first late-night stop, and her husband hasn't agreed to be on the show even though Sen. Hillary Clinton will appear tomorrow night.

"You're a very good-looking lady," Colbert told her, adding that he hopes Barack Obama comes on the show to punch him out of jealousy. Then he does a little serenade.

Here's the clip:

— Christina Bellantoni, national political reporter, The Washington Times