Donald Trump’s estranged niece threw an epic burn at her uncle as she gave her support to Kamala Harris for president. “I finally agree with Donald,” she wrote on X Sunday night. “It would be a huge mistake to elect the older candidate in American history.” She was referring to multiple attacks Trump has made on “Sleepy Joe” Biden’s age, claiming the 81-year-old was too old to effectively do the job. Want more breaking political news? Click for the latest headlines at Raw Story. After Biden dropped out Sunday, Trump, 78, becomes the oldest candidate to stand for president of the U.S. In 2020, …