Mark Twain said history doesn’t repeat but it rhymes. The life of Warren G. Harding rhymes with the presidential politics of our time. Harding died 100 years ago this week -- Aug. 2, 1923. Historians often rank him among America’s worst presidents. Yet this says more about them than it does about Harding. He had mistresses, but so did John F. Kennedy, and Harding didn’t perjure himself to…