I have also heard the name Sam Nunn being tossed about. If that happens, Bush may loose the solid south.
Sam Nunn running with Kerry would be akin to 2000 when Cheney, with no personal aspirations of his own, ran with Bush.
Sam Nunn running with Kerry would be an interesting balance to Zell Miller, who's firmly in the Bush camp.
I don't think Sam Nunn would ever give this up:
http://www.inta.gatech.edu/nunn/forum_intro.html
and this: http://www.sgpproject.org/resources/nunnstatement052803.html
But in thinking of Sam Nunn, remember....he is not and has never been a liberal.