then at 8, elizabeth colbert presents her thoughts on the sixth extinction, an unnatural history. at 9 p.m. eastern, learn about slavery and e chance base from david lye bran davis, and at 10 p.m. "after words" with amy chua. and we wrap up tonight's prime time programming at 11 p.m. eastern with talk about how the pharmaceutical, gun and auto industries have negatively impacted public health. that all happens tonight on c-span2's booktv. >> there was a poll done in 2013 after the 2013 -- after the second inaugural which asked americans if ronald reagan were to to run today against barack obama, who would you vote for? they said reagan by 58%. over obama. and that's right after obama's re-election. in 2013. here's really fascinating, how was obama elected principally? the youth votes, right? the youth vote. that same poll they asked people ages 18-34 who would you vote for, reagan or obama? they picked reagan. they picked reagan. unlike the gallup, gallup does a presidents day poll every presidents day, annual presidents day poll. they've been doing this 13 times since 2001. reaga