Former president Barack Obama mocks Donald Trump over crowd size in new Kamala Harris campaign ad The ad, titled “Crowd Size,” features footage of Obama’s remarks at the Democratic National Convention in which the former president said Trump was a “78-year-old billionaire who has not stopped whining about his problems.” The ad then cuts to Trump at his rally talking about the crowds at the Vice President’s campaign event, before cutting back to Obama’s speech. Obama gestures with his hands, saying: “This weird obsession with crowd sizes.”