Obama's speech after meeting with O-Reilly

I know Bill O'Reilly is not a guy you want to interview unless you're really confident. Seeing Obama in a press interview after interviewed by O'Reilly, I can honestly say the man looked shell-shocked.
I have never seen Obama at a loss for words, except for those "coached" by his running mate Joe Biden. There were more "uhmm"'s and "ahh"'s than Bush's state of the union address.

If this isn't proof that the Obama camp sees Palin as a threat, I don't know what is - but I do admit Obama set the focus that he's running against McCain, not Palin.

So I ask you this: does a running mate really make a difference?