(CNN) – Newt Gingrich is edging out his rivals for the Republican presidential nomination in Mississippi, according to a new poll.
The American Research Group survey of likely Republican primary voters released Friday showed Gingrich with 35% support, followed by Mitt Romney with 31%, Rick Santorum with 20% and Ron Paul with 7%.
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Gingrich's margin over Romney increased slightly among those who said they will definitely vote in the March 13 primary, 37% to 30%. Santorum garnered 17% support and Paul received 5% among the same group.
The poll was conducted after Super Tuesday, when each of the GOP White House contenders picked up delegates. Romney won the popular vote in six states, while Santorum captured three and Gingrich nabbed one, his native Georgia.
Despite calls for him to bow out of the race, Gingrich has said he will remain in the contest until the convention and has also stressed the importance of wins in Mississippi and Alabama, which both vote on Tuesday.
Gingrich, the former House speaker, also led among tea party supporters and men in the poll. Forty-nine percent of those who support the grassroots movement were behind Gingrich, while 24% said the same of Romney. Seventeen percent said they backed Santorum and 5% said Paul.
Among men, Gingrich led with 39% to Romney and Santorum's 21% and Paul's 12%. However, Romney took the top spot among women with 42% support to Gingrich's 30%, Santorum's 19% and Paul's 2%.
ARG questioned 600 likely Republican primary voters by telephone in Mississippi between March 7 and March 8 with a sampling error of plus or minus four percentage points.