The latest polls out on the race for the Republican presidential nomination in Alabama and Mississippi suggest the outcome of each contest remains difficult to predict.
Former House Speaker Newt Gingrich is hoping to rebound in the race with strong performances in the primaries and prevail over rival contenders Mitt Romney and Rick Santorum.
Hawaii voters also went to the polls on Tuesday to cast ballots in the state's caucus.
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 primary day developments to unfold.