Jay’s away this week, so in a break from the ordinary, I welcome a bona fide liberal to Need to Know: the estimable William Galston, Wall Street Journal columnist, Brookings fellow, and scholar of American political life. We talk about the uses and abuses (well, I see abuses, Bill demurs) of executive power, respect for evidence, the polarization of American politics and life, and other matters. We find areas of agreement. It’s all so civilized you could spit. (Kidding.) Do join us.