Rick Santorum greets Catholic nuns at a Knights of Columbus rally, Feb. 24. Via Getty Images.
Mitt Romney has trounced Rick Santorum, an ardent Catholic, among Catholic voters, but Romney's support among evangelicals has wavered thus far in the GOP presidential primary, according to a new analysis of exit poll data.
Though he won evangelicals in two states, in general Romney has performed 15 percentage points better among non-evangelicals, according to an analysis released March 2 by the Pew Forum on Religion & Public Life.
Exit poll data is available in seven of the 11 states that have held primary contests to date, according to the Pew Forum. More detailed religious affiliations are available in six of those states.
White evangelicals formed more than a third of all GOP primary voters in each state except for Nevada (24 percent) and New Hampshire (21 percent). Romney, a Mormon, won the evangelical vote in those two states, and nearly tied for first in Arizona and Florida. But he lost the evangelical vote badly in three states: Michigan, Iowa and South Carolina.
Somewhat surprisingly, Santorum has not won the Catholic vote in a single state in which data is available, according to the Pew Forum.