Rick Santorum’s taken a large lead in Michigan’s upcoming Republican primary. He’s at 39% to 24% for Mitt Romney, 12% for Ron Paul, and 11% for Newt Gingrich.

Santorum’s rise is attributable to two major factors: his own personal popularity (a stellar 67/23 favorability) and GOP voters increasingly souring on Gingrich. Santorum’s becoming something closer and closer to a consensus conservative candidate as Gingrich bleeds support.

Santorum’s winning an outright majority of the Tea Party vote with 53% to 22% for Romney and 10% for Gingrich. He comes close to one with Evangelicals as well at 48% to 20% for Romney and 12% for Gingrich. And he cracks the 50% line with voters identifying as ‘very conservative’ at 51% to 20% for Romney and 10% for Gingrich.

Santorum’s benefiting from the open nature of Michigan’s primary as well. He’s only up by 12 points with actual Republican voters, but he has a 40-21 advantage with the Democrats and independents planning to vote that pushes his overall lead up to 15 points. Santorum is winning by a healthy margin in every region of the state except for Oakland County, where Romney has a 40-26 advantage, and the area around Lansing where Paul actually has an advantage at 30% to 27% for both Romney and Santorum.

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