A meme of Batman slapping Robin was used in 2016 both for and against Bernie Sanders. One version is straightforward; Robin says Sanders would be a great president, and Batman swats him, shouting, “Moron!” In the other, however, Robin claims Sanders can’t win, and the caped crusader smacks him in exasperation, bellowing that Bernie would win if people stopped being defeatist and voted for him.

This electability dilemma looms over Democrats struggling to prevent President Trump from winning a second term in November’s big clash.