Romney wins another state - CNN.com Mitt Romney wins Wyoming caucuses Romney and Rick Santorum split the delegates from Michigan New Gingrich says he has to win Georgia on Super Tuesday (CNN) -- Mitt Romney won the Wyoming caucuses as the Republican presidential campaign headed toward next week's Super Tuesday showdown, with one candidate acknowledging Thursday he needs a victory to keep his campaign alive. Former House Speaker Newt Gingrich, campaigning in Atlanta ahead of the Georgia primary March 6, made clear he has to win the state he represented in Congress. "I have to win Georgia, I think, to be credible in the race," said Gingrich, who has won only one primary so far, in neighboring South Carolina. Gingrich is vying with former Pennsylvania Sen. Rick Santorum to be the conservative alternative to the more moderate Romney in the race for the Republican nomination to face President Barack Obama in November. Romney bolstered his delegate lead Wednesday by winning in Wyoming, where Republicans held caucuses and cast votes in straw polls in recent weeks. Based on results compiled and released by the Wyoming Republican Party, Romney won 39% of the votes cast in straw polls conducted at county-level caucuses while Santorum got 32%, Rep. Ron Paul of Texas received 20% and Gingrich got 8%. Of the 26 delegates at stake, CNN estimates Romney will pick up 10, while Santorum will take in nine delegates, Paul will receive six and Gingrich one. CNN estimates that so far in the campaign, Romney has 181 delegates, Santorum has 61, Gingrich has won 39 and Paul has 33. It takes 1,144 delegates to secure the nomination. The Wyoming caucuses mark Romney's third victory this week, after the former Massachusetts governor got much-needed wins in Arizona and Michigan on Tuesday. However, Romney's Michigan win came with an asterisk. The latest CNN delegate estimate indicates that Romney and Santorum will evenly divide the 30 Michigan delegates at stake. Santorum claimed a partial victory Wednesday, even though Romney got more overall votes in Michigan. This is a huge win for us. Let's play it the way it is -- don't give Romney all the spin," Santorum told reporters in reference to the Michigan results. We went into his backyard. He spent a fortune -- money he had no intention of spending -- and we came out of there with the same number of delegates. Analysis: Super Tuesday won't help clear up race In a sign of growing momentum, a Santorum campaign source told CNN that the former Pennsylvania senator will report raising $9 million in February from more than 130,000 contributors, and that Wednesday has been one of the campaign's best fundraising days of the cycle. Romney, meanwhile, took aim at Santorum as he campaigned in Ohio, another major battleground in next week's Super Tuesday showdown with contests in 10 states. "Rick Santorum is a nice guy, but he is an economic lightweight," Romney told a crowd at Capital University in Bexley, an affluent suburb of Columbus. He doesn't understand what it takes to make the economy work on a personal basis. It takes "real experience" in the private sector and not "talking points" from a briefing book to understand how the economy works, Romney argued. Earlier, Romney said at a Toledo event that Republicans need a candidate from outside the Washington culture of Obama and the other Republican challengers. "I just don't think we are going to beat Barack Obama and get our country back on track if we have guys whose resume looks like his resume," Romney said. Tuesday's results were a relief for Romney, who needed to win both states, but especially needed Michigan -- where he grew up when his father was governor -- to assert his ability to overcome the conservative challenge from Santorum. A Santorum victory in Michigan would have raised questions about how strong a candidate Romney is within his own party as the campaign heads into a busy schedule of primaries and caucuses. The former Massachusetts governor's big night also gained him all 29 delegates from Arizona, a winner-take-all state, where he had 47% of the vote to 27% for Santorum, 16% for Gingrich and 8% for Paul, with all of the precincts reporting, according to the secretary of state's website. The 10 states holding primaries and caucuses on Super Tuesday have 437 delegates, with 419 of them to be allotted based on the results in those contests. The other 18 delegates are not tied to the results. Other major states on Super Tuesday will include Georgia, Tennessee and Oklahoma, all traditionally conservative territory where Gingrich must do well to keep up his campaign's viability. CNN.com's interactive GOP delegate counter However, Gingrich's hope of building a strong support base in the South after his lone victory in South Carolina appears in trouble. Santorum holds a big lead in polls in Tennessee and Oklahoma, as well as Ohio. The primary and caucus results continue to show that combining the support for Gingrich and Santorum generally equals or exceeds the support for Romney, who has been unable to increase his level of backing despite an advantage in money and organization. On Tuesday night, Santorum said the Michigan outcome showed the Republican race was a two-person showdown between himself and Romney. That argument was intended to increase pressure on Gingrich to step aside so that Santorum can galvanize conservatives. Gingrich indicated Thursday that, despite his need to win Georgia, he was disinclined to drop out. "Part of why I am not going to back out is I think people deserve a chance to have a genuine conservative and based on people donating across the country, I think they agree," Gingrich said. He added that Romney "can't close the sale" despite spending far more than the other candidates so far. "If he can't close the sale, our job is to go out and keep making the sale until we finish closing it," Gingrich said. And as you see us get to more and more states, the narrative will become more and more that there is a real alternative. Romney has led nationwide polls off-and-on over the course of the campaign, but has been unable to increase his support base. Santorum is the latest of Romney's rivals to challenge him for front-runner status by playing on conservatives' reservations about the former Massachusetts governor. Santorum's hat trick earlier this month in Minnesota, Missouri and Colorado propelled him to a lead in national polls and a double-digit lead in Michigan two weeks ago. However, he had a lackluster performance in last week's CNN Arizona Republican debate and has fallen into a statistical tie with Romney in national polls. Paul, the libertarian champion making his third bid for the White House, was looking to the Washington state caucuses on Saturday and Super Tuesday to try to increase his delegate count. "We'll continue to work in the caucus states" where investments of time and resources pay off in delegates, Paul told CNN. CNN's Ed Payne, John King, Keating Holland, Robert Yoon, Jim Acosta, Paul Steinhauser and Rachel Streitfeld contributed to this report