The sound of silence tells an interesting tale when it comes to Fred Thompson. A week after reports emerged suggesting that the former Tennessee senator once lobbied for an abortion rights group, few leaders of the GOP’s conservative wing have expressed concern. In fact, the fallout in conservative circles has largely been confined to defending Thompson and attacking the Los Angeles Times, which broke the story. And this comes, as reported by Politico’s Mike Allen, as Thompson has dropped his flat denial of the charge and now instead says he can’t remember. The muted reaction illuminates a larger point: just...