Rick Santorum's political good fortune in the Republican presidential primaries has come about in large part because of his appeal to evangelicals. A Roman Catholic, he is a beneficiary of more than two decades of cooperation between conservative Protestants and Catholics who set aside theological differences for the common cause of the culture war.

Doctrine — and anti-Catholic bias — once split Protestants and Catholics so bitterly that many evangelical leaders worked to defeat John F. Kennedy because of his religion. When Kennedy sought to confront suspicion about his Catholicism, he made his now-famous faith speech to the Greater Houston Ministerial Association, a group of evangelical Protestants in Texas. Five decades later, when some prominent evangelical leaders gathered at a Texas ranch to discuss backing a 2012 GOP candidate, Santorum was their choice.

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