"Some of the worst violence in American history occurred during the period of low partisan polarization stretching from the late Progressive era to the late 1970s-the moment for which Joe Biden waxed nostalgic. In Ivy League debate rooms and the Senate cloakroom, white men could discuss the most divisive issues of the day with all the politeness befitting what was for them a low-stakes conflict. Outside, the people whose rights were actually at stake were fighting and dying to have those rights recognized."