Jacksonville, Florida (CNN) - What a difference a big win can make.
A new poll indicates that since Newt Gingrich's double digit victory in Saturday's South Carolina primary, the former House speaker's surged among people likely to vote in next Tuesday's Republican presidential primary, and he's moved ahead of former Massachusetts Gov. Mitt Romney.
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According to a Quinnipiac University survey released Wednesday morning, Romney is at 36% support, with Gingrich at 34%, former Sen. Rick Santorum of Pennsylvania at 13%, Rep. Ron Paul of Texas at 10%, and seven percent undecided. Romney's two point margin is well within the poll's sampling error.
The survey was conducted Thursday through Monday, both before and after the South Carolina primary. Looking at the numbers for Thursday through Saturday, before the results of the Palmetto State contest were known, Romney had a 37% to 26% lead over Gingrich, with Santorum and Paul each at 15%.
But looking just at Sunday and Monday numbers, after the news of Gingrich's big win in South Carolina, the former House speaker has a 40% to 34% advantage over Romney, with Santorum at 11% and Paul at 6%.
"Florida is essentially a dead heat and a two-man race between Gov. Mitt Romney and Speaker Newt Gingrich entering the last week of the campaign," said Peter A. Brown, assistant director of the Quinnipiac University Polling Institute. "Gingrich's South Carolina victory clearly gives him a boost in Florida. The question is whether there is more of that to come, or whether any bump from a previous victory will dissipate as happened to Rick Santorum in New Hampshire after winning Iowa and Romney in South Carolina after taking New Hampshire."
According to the survey, 38% say they might change their mind on which candidate they are backing, and there's little difference among Gingrich and Romney supporters in terms of thinking they may alter their decision.
The poll indicates that Romney is viewed as more likely to best handle the economy and shares the most values with voters, while Gingrich is seen by more those questioned as having the knowledge and experience to be president, being a strong leader and best at dealing with foreign policy.
According to the survey, Gingrich has a 37%-33% margin over Romney among men while Romney holds a 38%-31% advantage over Gingrich among women. Gingrich has a 13-point lead over Romney among those who describe themselves as white evangelical Christians and leads by 15 points among self-described tea party movement supporters.
The Quinnipiac University poll was conducted January 19-23, with 601 likely GOP primary voters in Florida questioned by phone. The survey's overall sampling error is plus or minus four percentage points.
– Follow Paul Steinhauser on Twitter: @PSteinhauserCNN