I could see Lieberman as a VP candidate (again). He might be very socially liberal but surprisingly he's quite well respected by the RR because of his anti-pornography work, by Northern Republicans and by the base because of his stance on Iraq. Putting him on the ticket is no more implausible than putting HW on the ticket in 1980. A McCain-Lieberman ticket might be only ticket that could win 54%+ of the vote for the GOP and end the trend of '4th and Inches' elections.
http://thepoliticaltipster.wordpress.com/2007/12/17/is-this-the-moment-that-lieberman-changed-politics/
I would respectfully disagree about the Religious Right's view of Lieberman. They may like his support for warning labels on music, tighter restrictions on internet porn and his "Israel is always right" perspective on international policy.
(The John Hagee crowd especially loves him.)
But unless the RR is planning to shift emphasis, they'll never fully put their arms around a guy who they believe enthusiastically supports the "murder" of unborn children.
I basically agree. Even though Lieberman agrees with most Republicans on national security issues, he disagrees with them on so many other issues that it's crazy to think that McCain, who already has enough problems with his own party, would pick Lieberman as his VP. The only way that would happen is if they were to run on some kind of hawkish-on-foreign-policy/moderate-on-domestic-policy 3rd party ticket.