BRENHAM, Tex. — Evangelical leaders pursued a last-ditch effort on Saturday to exert influence in the Republican presidential primary race, voting to support the candidacy of Rick Santorum in hopes of undercutting Mitt Romney’s march to the nomination.

A week before the South Carolina primary, a group of more than 100 influential Christian conservatives gathered at a ranch here and voted overwhelmingly to rally behind Mr. Santorum. An organizer described the vote as an “unexpected supermajority,” a decision that was intended to help winnow the Republican field and consolidate the opposition to Mr. Romney.

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