OK, I looked at this on youtube and noted that it seemed to cut McCain off in mid-sentence. And in fact, it did. Here is the complete response.
MCCAIN: “John Kerry is a very close friend of mine, and we’ve been friends for years. Obviously I would entertain it... but there is, I see no scenario, no scenario, no scenario, where, I foresee no scenario where that will happen.”
Is he saying he doesn't foresee actually being asked, or doesn't see any scenario where he would accept even if he was asked?
I'm also curious why McCain wouldn't answer something closer to "Don't be ridiculous."