Yes, Donald Trump is making a second appearance on this list. In 2011, Donald Trump became the main spokesperson for the “birther” movement — a racist conspiracy theory claiming that former President Barack Obama was not a U.S. Citizen. Trump spent years perpetuating this lie, which helped him grow a significant base of Republican support. It wasn’t until 2016, that Trump finally backed-away from his claims that the first Black president was born in Kenya. While in office, Trump defended said that there were very fine people on both sides during a neo-Nazi rally in Virginia. (There’s plenty more to say about Trump, but that would be its own list).