The VP is going to be the difference for both Obama and McCain ... my guesses are:
McCain and Lieberman (or maybe Huckabee)
Obama and Clinton
An Obama / Clinton ticket is not a sure thing, but is probably the only way they're going to be able to take on McCain.
There's a remote chance that Gore could become the Democratic nominee and choose Obama as the running mate.
Sounds crazy, but, from my understanding, that is theoretically possible, since neither Democratic candidate has enough pledged delegates - thus it could come down to a brokered vote at the convention for someone other than either of them, such as Gore.
See link below for more details of how Gore (or someone else) could potentially become the Democratic nominee.
http://www.huffingtonpost.com/hooman...r_b_99893.html
Ron