Comedian Bill Maher was the guest of honor at the Kennedy Center on Sunday night. But President Donald Trump’s presence wasn’t far away.Limited time: Save 25% on NBC News subscriptionGet exclusive reporting, live Q&As and ad-free reading.Just moments after Maher began to accept the prestigious Mark Twain Prize for American Humor, Matt Friend, a leading impersonator of the president, took to the stage and, in Trump’s voice, joked that he would accept the award himself. Trump was a punchline for other comedians and entertainers, including Whitney Cummings, Jay Leno and Woody Harrelson.For the most part, the barbs weren’t particularly biting....