Donald Trump, a study released Monday found.That's 455 jokes about Trump and 14 about Democrat Joe Biden, according to the Center for Media and Public Affairs at George Mason University. That doesn't even count 64 jokes made about Trump's family or administration, the study said.“When Trump's onstage, everyone else is blacked out,” said Robert Lichter, communication professor at George Mason.He's been studying late-night humor and politics since 1992.