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If Mitt Romney wins the battleground state of Ohio tonight he'll pretty much lock up the Republican nomination for president. But Matt Dowd told me on "GMA" that he's also keeping an eye on Tennessee and Georgia.

"[Romney] has to show some strength in this country and in this process of winning a southern state. Tennessee is the place for him to do that," Dowd, an ABC consultant, said. "And if Rick Santorum loses Ohio the only other place really that he can show that he is still in the game is Tennessee."

It's do or die in Georgia tonight for Newt Gingrich. He's put his campaign on the line in his home state, saying it's "essential" for him to win there.

"Newt Gingrich could be Lazarus again, win big and still stay in this race," Dowd said.

That's looking likely, but if the former House Speaker loses Georgia, it's all over.

Get more of Dowd's take on Super Tuesday here: