Kevin Spacey, the Oscar-winning actor whose career was derailed by multiple allegations of sexual abuse, made a surprise endorsement of independent candidate Robert F. Kennedy Jr. on Monday. In a Twitter post, Spacey explained why he supported Kennedy, an anti-vaccine conspiracy theorist who is running what Democratic critics say is a spoiler bid aimed at harming President Joe Biden. “There’s a lot I can learn from this man,” Spacey explained. “When the world turned its back on me, Bobby leaned in. He’s a formidable fighter for justice and a loyal friend that’s not afraid to stand up for what …