By Dan Gilgoff, CNN.com Religion Editor

(CNN) - The ex-wife of a Republican politician alleges her then-husband asked if they could have an open marriage, so evangelical “values voters” rethink their support for him, right?

Not so fast, say some evangelical leaders and experts.

Presidential candidate Newt Gingrich’s second ex-wife, Marianne, made the “open marriage” allegation in an interview that aired Thursday night on ABC News.

But because of political circumstances and the way Gingrich parried a question about the accusation during Thursday’s CNN debate, the episode may cause relatively little fallout among evangelical voters, who are expected to make up about 60% of the vote in Saturday’s South Carolina primary.

Some say the drama may even help Gingrich among such voters.

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