MSNBC anchor Katy Tur was at the Edward M. Kennedy Institute on Tuesday night to talk about her new book, “Unbelievable: My Front-Row Seat to the Craziest Campaign in American History.’’ WBUR’s Robin Young led the interview with Tur about her election experiences. The book includes an anecdote about President Donald Trump seeing Tur backstage before an appearance on “Morning Joe,’’ and “barreling’’ toward her to give her an unwanted kiss on the cheek. “My eyes widen. My body freezes. My heart stops,’’ Tur writes. “Morning Joe’’ coanchors Joe Scarborough and Mika Brzezinski, spoke at Harvard last week.