Amid all the scandals related to the Clinton family, Bill Clinton's sex scandals were supposed to be a dead letter. After all, the former president weathered impeachment proceedings in the late 1990s-in fact, Hillary Clinton's popularity soared at the time. As those events receded, Bill Clinton became one of the most popular politicians in America, a smiling, drawling avatar of the happy, carefree 1990s. There were questions about how the Hillary Clinton presidential campaign might use her husband, and whether he'd be an asset or a liability (as he was in 2008), but sex wasn't in the picture. This week,...