Mention of Sarah Palin as VP sends McCain into stitches

Sen. John McCain had a serious case of the giggles this moing. When asked by CBS' Erica Hill about possible vice presidential candidates, he responded: \"I think it should be Sarah Palin\" and then started laughing. A lot.

He then shrugged off the suggestion and named a few other potentially qualified candidates, including Marco Rubio, Chris Christie and Bobby Jindal. \"I'm sure Mitt will make the right choice.

Obviously, it's a tough decision,\" McCain continued before cracking up again.

The slap-happy senator might have been poking fun at his former running mate, or perhaps there's a simpler explanation: He got up at the ungodly hour of 2:45 a.m. to do this interview.

What in the world was McCain really laughing at?