Marianne Gingrich, Republican presidential candidate Newt Gingrich's "second ex-wife"-- as the promotional material puts it-- unloaded on the former House Speaker as a philandering hypocrite in an interview with ABC's Brian Ross scheduled to air tonight on “Nightline.” The much-anticipated interview comes as Gingrich's candidacy is surging and just a day before South Carolina primary voters will head to the polls.