Harry Enten, formerly an analyst with FiveThirtyEight and currently with CNN, explained the damning new poll numbers for JD Vance. There's usually a bump for candidates following a convention, but JD Vance won the honor of having the worst poll numbers directly following their convention since 1980. ERIN BURNETT: What do you see right now? HARRY ENTEN: Frankly, I don't really understand the pick, and apparently neither do the American voters. Because we take a look at the net favorable rating for J.D.