McCain is dying in the polls and money wise. He isn't worth mentioning anymore but pundits and people like us tend to, and there isn't a chance he'll take VP at his age.
Rudy could very well win. He is loved by independents for his more liberal streak in social issues that show him to be a "independent free thinker" and republicans love him because he is tough on defense. He will be VERY hard to beat. Hardest candidate to go up against since Bush in '88.
Oh and there is 0% chance of Hillary and Obama teaming up. Hillary will pick a fellow clintonisa. A Bill Richardon or Evan Bayh. Obama will pick someone with foreign policy experience to make up for his youth and lack of experience, Bill Richardson is a name often mentioned as good VP for him.
Richardson is basically the go-to VP for Obama & Hillary.
He is from a swing state, was part of the clinton admin(plus for hillary), LOADS of foreign policy experience (plus for Obama)