(CNN) - With two days to go until Super Tuesday, it's all knotted up in Tennessee's Republican presidential primary, according to a new poll.
An American Research Group survey released Sunday indicates that 35% of likely GOP primary voters in the state are backing former Sen. Rick Santorum of Pennsylvania, with 31% supporting former Massachusetts Gov. Mitt Romney, 20% backing former House Speaker Newt Gingrich and 9% supporting Rep. Ron Paul of Texas. Santorum's four point advantage is within the poll's sampling error, which means it's basically all tied up.
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Two polls conducted in the state late last month, from Vanderbilt University and Middle Tennessee State University, both indicated Santorum with a double digit lead over his rivals for the GOP nomination.
Fifty-five delegates are up for grabs Tuesday in Tennessee, one of 10 states to hold contests on Super Tuesday.
Tennessee allows early voting, and the ARG survey indicates that Santorum has a 47%-35% lead over Romney among those who've said they've already cast a ballot in Tuesday's contest, with Gingrich at 11% and Paul at 7%.
Among those yet to vote, Santorum has a 32%-30% margin over Romney, with Gingrich at 23% and Paul at 9%.
"Although the 12 percentage-point early-vote lead for Santorum gives him a cushion, Romney is gaining among voters saying they will vote on Tuesday and Santorum's early vote may not be enough to hold off Romney because Gingrich has gained strength at Santorum's expense," says a press release by ARG.
Tennessee holds an open primary, which means Republicans, Independents and even Democrats can vote in the GOP presidential contest. According to the poll, Santorum has a seven-point margin over Romney among self-identified Republicans, with Romney holding a six-point margin over Santorum among self-identified independents and Democrats.
The survey indicates that Santorum has a 43%-30% lead over Gingrich among people who say they are supporters of the tea party movement, with Romney at 17% and Paul at 5%. Among non-tea party supporters, Romney leads with 49%, followed by Santorum at 24%, Paul at 14% and Gingrich at 8%.
Santorum has a nine point advantage over Romney among men, with Romney holding a two point margin over Santorum among women.
The ARG poll was conducted March 1-3, with 600 likely GOP primary voters in Tennessee questioned by telephone. The survey's overall sampling error is plus or minus four percentage points.
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