Hillary Clinton recently went where other liberal candidates fear to tread: The ORielly Factor.
Barack chose a more friendly venue, once again delivering the Top Ten, pre-recorded by satelite on the David Letterman show.
Of course they're in different situations. Hillary needs a miracle, so preaching to the choir isn't going to do her much good. Barack just needs to not get arrested between now and June and he's got the nomination. I guess it makes sense for him to keep his head low.
For what it's worth, here's the video: