I felt this skittishness for myself when I attended a “No Kings” rally last weekend in the blue town of Montclair. It’s a community full of commuters but also the home of Ms. Sherrill, a former Navy helicopter pilot and federal prosecutor who flipped her reddish district in 2018. Her opponent is the suspiciously well-tanned Republican Jack Ciattarelli, who is running for governor for the third time in a row.