Voters In Mississippi, Alabama and Hawaii Head To Polls

Polls show surprisingly tight races in the Republican primaries in Alabama and Mississippi. Voters in both states have been inundated with robocalls and TV ads.

Mitt Romney is trying to make a southern breakthrough by winning one of the states. While Rick Santorum wants Newt Gingrich to drop out so he can go one-on-one against Romney.

But Gingrich said he plans to campaign until the GOP convention in August, even though many say his candidacy really depends on how well he does today.

In an address to the Alabama Republican Presidential Forum in Birmingham on Thursday, Gingrich implored voters to turn out and support his candidacy.

"I've stayed in this race for two reasons," he said. "I do not believe the two other candidates can beat President Obama. We have to win in a principled way with a big enough agenda and enough momentum to change Washington decisively."

Ron Paul is hoping to do well in Hawaii's caucus.