The notion that the United States is “polarized” into two conflicting, equally stubborn and extreme camps infects much of the mainstream news coverage and everyday chatter about politics. Washington is “broken.” “Gridlock” is a problem. “No one goes out to dinner with someone on the other side.” Such mealy-mouthed language masks a stark dichotomy: Democrats have to move to the center to get bipartisan support; Republicans have become radicalized and unmovable.