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Democratic presidential candidate Howard Dean on Wednesday called for Republican Sen. Rick Santorum (photo) to resign his leadership post after the lawmaker compared homosexuality to bigamy, polygamy, incest and adultery. “Gay-bashing is not a legitimate public policy discussion; it is immoral,” Dean said. Santorum, Pennsylvania’s junior senator, is No. 3 in the GOP leadership, serving as the Republican Party’s conference chairman. A moderate Republican, Sen. Olympia J. Snowe of Maine, said in a statement Wednesday that she believes Santorum’s “unfortunate remarks undermine Republican principles of inclusion and opportunity”