i'll watch with interest how the campaign develops. >> reporter: six months ago, he was the presumptive front-runner. he's raised more than $100 million. why do you think he's struggling so? >> i can give you the same answer, jamie. i'm not going to get into the business of rating candidates or trying to analyze them or to do your job of analyzing how the candidates are doing. i'll pass. >> reporter: get your popcorn ready. it is the summer of donald trump, ladies and gentlemen. what do you think of donald trump? >> i don't know the man. i've never met him. >> reporter: watching this whole spectacle, what do you think? >> well, again, he's a candidate and i don't want to be in the business of rating candidates at this point, of grading them. i have not signed on with anybody and don't plan to today. >> reporter: you're not endorsing donald trump today? >> you can even -- that's a given. i'm not endorsing donald trump today. >> reporter: why do you think he's doing so well in the polls?