Does American need an anti-hero? We live in a time of partisan bickering, of a deepening divide between rich and poor, of random shootings and random meanness. You'd think this would call for a fictional hero to lead us masses out of humanity's sludge. Instead, this pre-holiday season, we had the Joker. A surprise hit that has lingered in theaters in December surrounded by sparkly Christmasy fare. A character study focused on Joaquin Phoenix (no other character in the movie r