 By picking J.D. Vance as his running mate, Trump chose someone he can pass the MAGA mantle to, someone who's very much in line with his political ideology. Now, in 2016, when he chose Mike Pence, Trump was looking to broaden his base of support with a more conventional conservative. But has a VP choice ever swayed voters when they got to the voting booth? Let's bring in Julian Zelizer, who is professor of history and public policy at Princeton University. Hi there, Julian. Hi, thanks for having me.