Sen. Barack Obama appeared this morning on Fox & Friends (as did his opponent, Sen. Hillary Clinton).

At the end of the interview, he hinted at a possible appearance on the O'Reilly Factor, following in the footsteps of Clinton's highly-rated appearance: "We're looking forward to it. We're going to see if we can fit it in."

Obama technically does owe O'Reilly an appearance (after all that "block the shot" drama).