Which 2020 Democrat should Donald Trump most be afraid of?

To get the inside view from the only people in the world who know what it’s like to run in a primary field so large -- and do so in the shadow of Donald Trump -- we invited the strategists for four of the top GOP primary campaigns of 2016 into a Washington cigar bar, a literal smoke-filled room, to talk shop. Which Democratic candidate has the most raw political talent? What weaknesses of Donald Trump's would they exploit in 2020? And why is everybody still so ticked off about the Virginia primary? Guests Danny Diaz (from the Bush campaign), Beth Hansen (Kasich), Jeff Roe (Cruz), and Terry Sullivan (Rubio).