Conservative columnist Robert Novak caused quite a stir over the weekend writing that a Democratic operative told him that the Clinton campaign possessed a cache of scandalous information about rival presidential candidate Barack Obama, but had decided not to use it. Before long, the camps of the frontrunner and her closest challenger were trading accusations and denials, much to the delight of bored reporters and pundits looking for something to spice up the dulling march to Mrs. Clinton’s coronation as the 2008 Democratic presidential nominee. The ensuing discussions about the source, timing and substance of the claims gave rise to...