J.D. Vance had a well-established record of bashing Donald Trump before ultimately groveling for — and winning — the former president’s endorsement in the upcoming Republican U.S. Senate primary in Ohio. But an unearthed Facebook message from 2016 shows just how shameless Vance’s pivot from Trump skeptic to sycophant has truly been. On Monday, Democratic Georgia state Rep. Josh McLaurin, Vance’s old college roommate, tweeted what he said was a message he received from Vance, who expressed concern that Trump might be “America’s Hitler.” “I go back and forth between thinking Trump might be a cynical asshole like Nixon who...