Republicans are looking to the South for some clarity in their presidential nomination battle, with voters in Mississippi and Alabama headed to the polls Tuesday in what looks to be another close-fought pair of contests.

Surveys of the two states show the top three GOP presidential candidates all within points of each other, setting up another high-tension election night in the hard-fought GOP campaign.

But early reports indicate turnout was low. And thunderstorms sweeping across the region — which forced Newt Gingrich to cancel a planned campaign stop at the Birmingham zoo — only underscored the unpredictability and volatility of the race