MANCHESTER, N.H. – Gary Bauer, a social conservative leader and former Republican presidential hopeful, said that he will endorse Rick Santorum’s bid for the party’s presidential nomination during a visit to South Carolina on Sunday.

Mr. Bauer, who declared in an interview earlier this week that he would not take part in a concerted effort “to try and stop Mitt Romney,” said he concluded that Mr. Santorum’s middle-class background made him a stronger general election candidate against President Obama.

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