E.J. Dionne: Stick-it-to-the-libs is all Trump has left

Washington • The Fifth Avenue Murder Theory now faces its toughest test.This bold hypothesis was put forward in 2016 by Professor Donald Trump, who claimed that he could "stand in the middle of Fifth Avenue and shoot somebody" and not "lose any voters."His proposition is by no means implausible. He won his Electoral College majority despite his louche and obscene admissions to sexual assault in the "Access Hollywood" tape. He has survived revelations of hush-money payments to alleged paramo