Obama-Nunn??

Maybe, with Bob Barr's candidacy for the Libertarians, it could hand Obama Georgia:

Since Bill Clinton narrowly carried Georgia in 1992, the state has gone Republican, but by inconsistent margins.

This election could be the perfect storm for Democrats to turn Georgia blue: Obama likely would inspire high turnout among African-Americans (who represent 30 percent of Georgia’s population); McCain might suffer low turnout among religious conservatives long skeptical of him; and the just-announced Libertarian candidacy of Bob Barr, a recent Republican member of Congress from northern Georgia, could siphon conservative votes from McCain.

With this confluence of forces working for the Democrats, Nunn joining the ticket could take Obama over the top in the ninth-largest state.