MARTHA'S VINEYARD, MA—While lounging about in his seaside mansion Tuesday, former President Barack Obama was asked whether he supported Joe Biden in the 2020 election. "Sorry, who?" Obama responded, sipping a strawberry daiquiri brought to him by his servants. "Hmmm... Biden, Biden... not ringing any bells." He was informed Joe Biden served as vice president under him for eight years, but he just stared blank-faced. "Nope, it's not coming to me. Oh, wait -- is he the guy that was in Home Alone and Goodfellas? Fine actor, very fine. Sure, I'd support him." Reporters let him know that was actually...