Some benedictions bestow a bigger blessing than others, and Mitt Romney hit the jackpot by signing up Cardinal Timothy M. Dolan, the president of the Conference of Catholic Bishops, to deliver the closing prayer at the Republican National Convention in Tampa, Fla., next week.

The move is perhaps the clearest sign of a more aggressive push by Republicans to win over Roman Catholic voters this election cycle. Four years ago, Barack Obama won the votes of a majority of Catholics, assisted in part by his Catholic running mate, Joseph R. Biden Jr.

But this time the Republicans sense an opportunity to cut into that advantage, at least with moderate and independent Catholics, because of two recent developments: President Obama’s endorsement of same-sex marriage and the standoff between the Obama administration and Catholic bishops over the requirement that Catholic hospitals and schools must provide coverage for birth control in their employee health insurance plans. The issue has become the centerpiece of a campaign by the bishops to defend what they consider a matter of religious liberty.

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