(CNN) - A new poll released Wednesday shows Newt Gingrich topping the Republican presidential field in Oklahoma, less than a month before the state's Super Tuesday primary on March 6.
Thirty-four percent of likely Republican primary voters said they would back the former House speaker, while 31% said they would vote for Republican frontrunner Mitt Romney, according to the American Research Group survey.
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Rick Santorum, who pulled an upset Tuesday night with his three-state victory, came in with 16% and Texas Rep. Ron Paul took fourth place with 10%.
The survey was conducted Monday and Tuesday, entirely before Tuesday night's results revealed Santorum's big victories in Minnesota, Missouri, and Colorado.
The former Pennsylvania senator is campaigning in North Texas on Wednesday with plans to stop in Oklahoma on Thursday. The Sooner State has 43 total Republican delegates.
As for tea party support, Gingrich took a wide lead over his opponents. The poll shows Gingrich with a 46%-26% advantage over Romney among those who support the conservative grassroots movement, while Santorum followed behind with 15% and Paul at 7%.
The former House speaker, who won the South Carolina primary and came in second place in Florida last month, has indicated he plans to aggressively focus on the Southern states.
The American Research Group surveyed 600 likely Republican primary voters in Oklahoma by telephone February 6-7, with a sampling error of plus or minus four percentage points.