A historian who uses 13-so-called “keys” to accurately predict presidential elections slammed prominent statistician Nate Silver on Friday as the duo’s rivalry spilled onto X for bemused onlookers to see. Historian Allan Lichtman, a distinguished history professor at American University, uses 13 true-false questions to determine who will win the presidency. A candidate receives a “key” if a question is true. In late July, he revealed that Democrats have the edge using his time-tested formula. This week, he doubled down and predicted that Kamala Harris will win in 2024. Want more breaking polit…