Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. March 13, 2012 Polls Close in Alabama, Mississippi Republican Primaries VOA News Danny Cooper, of Chilton County, Ala. waves to motorists outside a polling place, in Vestavia Hills, Alabama, March 13, 2012. Photo: AP Danny Cooper, of Chilton County, Ala. waves to motorists outside a polling place, in Vestavia Hills, Alabama, March 13, 2012. The polls have closed in Alabama and Mississippi after voters cast ballots Tuesday in the Republican presidential primaries in the two southern U.S. states. Exit polls are showing Mitt Romney is barely ahead of Rick Santorum in Mississippi, while Santorum is leading Romney in Alabama. The other top candidate, Newt Gingrich, is in third place in both states. The results of the races in Alabama and Mississippi, two predominantly conservative states, are important to each of the candidates. Romney is hoping for victories to propel him forward and prove he can win over very conservative and evangelical Christian Republicans, who have been drawn to his main rival, former U.S. senator Santorum. Santorum wants to knock Gingrich out of the race to stand as the sole conservative challenger to Romney. Gingrich, a former U.S. House speaker, has focused his efforts on the southern vote and is hoping victory on Tuesday will make him the comeback favorite for the nomination. Otherwise, he could face increased calls to drop out. Romney, a former Massachusetts governor, is far ahead of the others in the delegate count, winning nearly 40 percent of the 1,144 needed to secure the party's nomination. A new Washington Post-ABC News poll shows he leads U.S. President Barack Obama in a hypothetical election match-up (49 to 47 percent), while Santorum would be in a competitive race, three points behind (46 to 49 percent) Mr. Obama, if the election were held now. The other Republican candidate, U.S. Representative Ron Paul, has not won a nominating contest. He has single digit support in Alabama and Mississippi. The Pacific island state of Hawaii and the U.S. territory of American Samoa are holding caucus elections on Tuesday. The Republican Party will formally nominate its presidential candidate at its convention in Tampa, Florida, in late August. The nominee will face Mr. Obama, a Democrat, in the November election. Some information for this report was provided by Reuters. .