It’s the November rematch few Americans want — except the ones who keep voting for it. Donald Trump and Joe Biden romped across the Super Tuesday map‚ easily wiping out their closest challengers and marching to the precipice of their respective nominations. But while Tuesday’s elections served as a stark reminder of the grip both men have over their parties‚ they also offered the best glimpse yet of each candidates’ general election frailties — from Trump’s struggles with well-educated...