>> reporter: and fight literal between donald trump and ted cruz. the current front-runners who just plain refused to rumble. >> maniac, one heart beat away from the presidency. >> he has a wonderful temperament. he's just fine. don't worry about it. >> reporter: finally, a revealing truce, perhaps, between donald trump and the party. his strongest disavowal yet of a third party run. >> i am totally committed to the republican party. i feel very honored to be the front-runner. >> to take mr. trump's word, that admission was huge that he made, that he will not run as a third party candidate. an amazing give back of leverage for him, an amazing sigh of relief for reince priebus and the rnc to be sure. how did donald trump do on the stage? how does he think he did? i'll tell you what. he was different, on the stage and after the debate, than i've seen him in the past. here's a little look at our