front. he has a five-point lead over ted cruz, the best trump has done in that poll so far in this race. joining me to talk about all of this, cnn senior political analyst david gergen. let's talk about ted cruz. he has the momentum heading into tuesday night. what do you expect to see from him and what questions not from the moderators per se but what do you expect to see from his opponents on the stage in terms of how they deal with ted cruz on tuesday? >> certainly because of his surge in iowa, john, he will be the man to watch on tuesday night. can he maintain the momentum, can he increase it? and because so much of the focus is going to be on national security, he's going to get attacked mostly from his right as being too cautious, you know, too unwilling to use american force, not strong enough to really get the job done against isis. you'll be hearing that particularly from marco rubio. what we don't know is how trump