Anything with Rachel Maddow, she's actually a good questioner and not as crazy as Beck, Coulter, Bill O'Really?, or Keith Olbermann.
Now let's narrow it down.
Olbermann and O'Reilly would just yell at each other the whole time.
Coulter is a known idiot, but O'Reilly is not, he contradicts himself a lot but he is reasonably debate worthy.
Maddow is one of the few "newscasters" (you can define that however you want) that asks tough questions and incites good responses.