Pundits who decry ‘tribalism’ know nothing about real tribes

The U.S. electorate, commentator Andrew Sullivan wrote recently, has devolved into “two tribes whose mutual incomprehension and loathing can drown out their love of country.” In the New Yorker, George Packer argued last fall that politics today “requires a word as primal as ‘tribe’ to get at the blind allegiances and huge passions of partisan affiliation.”