for a new round of attacks in wednesday night s debate. john berman has more. the polls come out and we re really killing it. we are killing it. reporter: a new poll from the new york times shows ben carson closer than ever with jeb bush drifting farther back. cars bush has dropped 7 points since august. nothing and no one has managed to push trump from its perch. but when the going gets tough, the tough go negative. for the first time an outside group, the conservative club for growth opened its wall let. trump, the worst kind of politici politician. reporter: announcing they ll spend more money in iowa on ads. he has a record, and it s very liberal.