Santorum expected to win in Louisiana NEW ORLEANS, March 24 (UPI) -- Polls show Rick Santorum likely will win the Louisiana Republican presidential primary, but political analysts say it won't be enough to catch Mitt Romney. CNN reported polls of likely voters in the past view days give Santorum a double-digit lead over Romney and former House Speaker Newt Gingrich. Santorum, a former U.S. senator from Pennsylvania, was expected to win in Louisiana with support from evangelical Christians. A CNN analysis showed Romney, a former Massachusetts governor, has 563 delegates, nearly half the 1,144 needed to clinch the nomination, to 251 for Santorum. In Louisiana's closed primary, meaning only registered Republicans can vote, 20 delegates are at stake Saturday, to be allocated among candidates who receive more than 25 percent of the vote. Another 26 delegates will be allocated at a state convention in June. Santorum gained momentum with primary wins in Alabama and Mississippi but lost to Romney in Puerto Rico and was defeated again in Illinois, where Romney had a 12-point win. Now, said Bruce Haynes, a GOP strategist and managing partner of Purple Strategies, a bipartisan public affairs consulting firm: "Santorum can't just win; he has to win big. He's the one who needs to 'shake up' this race. Another ho-hum win in the South doesn't cut it. He's on a political bridge to nowhere and is running out of time to change destinations. The New York Times reported turnout appeared light at some polling places in New Orleans.