just seconds ago we saw rick santorum arrive here at the reagan national library. today's coverage with the man himself mr. moderator host of this show and cnn's chief washington correspondent, jake tapper. let's check in with jake tapper. jake, what's your strategy for tonight? >> well, as you and i have spoken about, anderson, our goal is to get the candidates to debate each other. i thought the best moment in the first debate was when rand paul, senator rand paul and governor chris christie were passionately disagreeing on nsa mass surveillance. i thought that was just illuminating. they both were very, very passionate. disagreed very strongly. and we're going to try to prompt as much of that as possible encouraging the candidates to step up and explain why their view, why their position, why their policy is superior to the rival one on the stage.