McCain-Lieberman has got to be a not starter. Lieberman will not get McCain any appreciable votes...a few liberal hawks if any there be, a few Jewish votes...maybe. His addition to the ticket will alienate hard right voters, so at best it's a wash for McCain.

I don't know what Lieberman's long-term political goals are, or if he has any. But he would almost certainly never again be elected to public office again, if he ran for VP on a split ticket--unless, by some miracle, McCain won.