It will be tight over the summer, but his support of Akin and Mourdock will tank him. Polarization of electorate keeps the map from spilling into LBJ territory.
Obama: 379 ~53% PVHuckabee: 159 ~ 45% PV I think if O can take AZ and MO, he can take GA too.
Huckabee has great Southern appeal, so I think he takes Georgia, probably slim though.
But depending on how bad Huckabee does, maybe Obama might pick up a different barely-competitive area, like Montana or the Dakotas or that last Nebraska district.