Washington Post: By E.J. Dionne Jr.:vWhere evangelicals cast a minority of the ballots, Mitt Romney has won. Where evangelical voters predominated, Romney has lost, in most cases to Rick Santorum.
Romney’s victory Tuesday in Illinois fit snugly within this pattern. The result pointed to a continuing problem for Santorum: He has yet to break through in places where evangelicals were not the principal force.
While the exit polls did not question voters directly about their attitudes toward the Church of Jesus Christ of Latter-day Saints, there is indirect evidence that Romney’s faith may be holding down his vote among non-Mormons for whom a candidate’s religion matters.
But it’s also true that Romney’s Mormonism has had a positive electoral side. Solidarity among Mormon voters, eager to break a historical barrier, helped Romney win Arizona, Nevada and Idaho. Romney won 96 percent among self-identified Mormons in Arizona and 88 percent in Nevada.