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. January 21, 2012 South Carolina Polls Open in Republican Presidential Primary VOA News Locator map for South Carolina, featuring the Republican candidates running for their party's presidential nomination. Photo: VOA The polls have opened in South Carolina for Saturday's U.S. Republican presidential primary, expected to be a very tight race at the top. The front-runners among the four candidates have scheduled simultaneous campaign stops in the southeastern state at the same location Saturday. Recent polls suggest former Congressman Newt Gingrich is a surging challenger to former Massachusetts Governor Mitt Romney. On Friday, Romney tried to lower expectations, saying "to be in a neck-and-neck race at this last moment is kind of exciting." A week ago, many political polls indicated the South Carolina race would be an easy victory for former Governor Romney. But after sharp attacks from his rivals, and a series of upheavals in the race this week, many polls and political analysts say the race could be much closer. Gingrich could benefit from Texas Governor Rick Perry's decision to drop out of the race Thursday and endorse him. Gingrich joined Romney, former Pennsylvania Senator Rick Santorum and Texas Congressman Ron Paul in a volatile debate in South Carolina Thursday night. The final four contenders argued over jobs, health care, and leadership. Gingrich became angry when questioned at the start of the debate about allegations by his ex-wife that he asked for an "open marriage" in 1999 to accommodate an extramarital affair. He denied that accusation, although the former speaker of the House of Representatives has admitted having affairs during his first two marriages. For many American voters, the U.S. economy and high unemployment are the big issues in this election. President Obama has no competition for the Democratic Party's nomination this year, but many political analysts say the sluggish economy means he faces a tough race against the eventual Republican nominee. .