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Rick Santorum may have gained some momentum in Michigan over the last week, but will it last? The latest data from Public Policy Polling indicates that Santorum holds a small lead over Mitt Romney—38 percent of Michigan residents polled favor Santorum, and 37 percent say they like Mitt. But a deeper look at the numbers shows that Santorum has picked up that narrow lead in the last few days, and there’s no guarantee all those voters will turn out tonight. The poll is another indication that the two candidates are neck and neck as they prepare for the primaries in Michigan and Arizona, which hold 30 and 29 delegates, respectively. Ron Paul trailed in the poll, drawing support from only 14 percent of Michigan voters, and Newt Gingrich brought up the rear with 9 percent. Romney is currently leading the race for delegates, holding 123 to Santorum’s 72.