WASHINGTON - Jack Schlossberg had enough. The only grandson of former President John F. Kennedy, Schlossberg had been watching the presidential campaign of his cousin Robert F. Kennedy Jr. with increasing dismay. To Schlossberg, the quixotic challenge to President Joe Biden for the Democratic nomination was just a vanity project that was tarnishing the legacy of his grandfather and their storied family. Just days earlier last month, his conspiracy-minded cousin had suggested that the COVID-19
