things. they are very logical things. if people really sat down and thought about them rather than allowing themselves to be whipped into a frenzy. >> reporter: trump fresh off the campaign trail in iowa where he bragged about his lead. >> i love these polls. and i say to people when they always say you love to mention the polls, nobody else does. i said that's because they're losing. they're not stupid people. >> reporter: now he's struggling to explain two polls in as many days showing he's no longer on top. >> i was very, very surprised to see it because i think we're doing well in iowa. i have a feeling we're doing much better in iowa than the polls are showing, if you want to know the truth. but we had an amazing crowd. i'm sure you saw it because it was all over television. >> i did. >> reporter: polls show trump is still in first nationwide. but carson is looking to solidify his position going up on the air waves with two new ads slamming washington. >> did you know washington is built on a swamp? massive government debt,