Rep. Mike Collins (R-GA) made a joke about presidential candidate Robert F. Kennedy Jr.’s former brain parasite, which he connected to the assassination of Kennedy’s uncle and father. Collins was poking fun at a recent report that a doctor told Kennedy that a parasite had made its way to his brain, ate part of it, then died. The information was revealed in an article for the New York Times, raising questions about Kennedy’s cognitive ability. “You either die a Kennedy with a hole in the...