Well, who in tarnation is he supposed to talk too, those who already know him and know what he REALLY believes? How useless an interview would that be?
You have to think beyond your fixed scope. Do the DBM/dems suck? Yes, but there are some in that audience who are fence sitters and really don't know him for who he is, this will be a chance for them to see Bush, instead of what the liars in the DBM/dems tell and show veiwers who Bush is by their own bias drivel.
Sometimes, you have to play the game to get noticed!