The first guess was made between Iowa and New Hampshire. This one comes after Florida and before Super-etc. Tuesday. Hillary still seems to have the better odds on the Left, but McCain has been winning media mind-share, so:
Clinton v. McCain; McCain wins.It's a toss-up among the Democrats. There is another strong possibility:
Obama v. McCain. Obama wins, but is assassinated within two years.Of course, the Dems may self-destruct at the convention with an Obama/Clinton tie, leading to a brokered nomination:
Gore v. Any Republican; Any Republican wins.