The Alabama primary results will be closely watched on Tuesday night.
Former House Speaker Newt Gingrich is hoping to triumph over rival contenders Mitt Romney and Rick Santorum in the southern battleground. The latest polls out on the race in the Yellowhammer State show the three contenders in a tight fight to the finish line.
Ron Paul is also on the ballot in Alabama.
Voters in Mississippi cast ballots in the state's primary and voters in Hawaii cast ballots in the Aloha State's caucus on Tuesday.
From delegates to endorsements, click here for a rundown on who's ahead in the race for the Republican presidential nomination.
Below, a live blog of the latest developments to unfold.