This column has already told the story of Frank VanderSloot, an Idaho businessman who last year contributed to a group supporting Mitt Romney. An Obama campaign website in April sent a message to those who'd donate to the president's opponent. It called out Mr. VanderSloot and seven other private donors by name and occupation and slurred them as having "less-than-reputable" records. Mr. VanderSloot has since been learning what it means to be on a presidential enemies list. Just 12 days after the attack, the Idahoan found an investigator digging to unearth his divorce records. This bloodhound—a recent employee of Senate...