If John F. Kennedy, Tip O'Neill, or even Bill Clinton were to run as Democrat candidates today, their own party would cancel them in a heartbeat. If the Joe Biden of 1992 were to run today, MSNBC would label him "MAGA Joe." How did JFK's party of Catholics and union workers become AOC's party of privileged Ivy Leaguers with "Queers for Palestine" signs and purple hair? Over the past few decades, Democrats have swung so far to the left...