Why Romney and Santorum Fought to a Draw

Ron Paul expanded the electorate. Mitt Romney slightly advanced from his key beachheads in 2008. Evangelical Christians splintered but gave Rick Santorum the largest slice of their votes. Those dynamics, captured in the Edison Research National Election Pool entrance poll at the Iowa caucuses, explained the tight three-way race among the top contenders in Iowa. . . .

Ronald Brownstein, National Journal