down donations from the nra. >> senator rubio, can you tell me right now that you will not accept a single donation from the nra in the future? >> the answer is people buy into my agenda. >> reporter: when asked if he'd support banning semiautomatic rifles outright, he also refused to do it, saying it was complicated. sunlen serfaty, cnn, washington. >> well, the politics with gun control, of course, are always treacherous, even with senator rubio's promise to change some of his positions. nothing at all is certain in congress. with me now, cnn's political director, david chalian, and cnn chief political correspondent, dana bash. david, how much political capital did senator rubio spend or earn last night at the town hall? he obviously did a lot of pushing back and clarifying. it was a difficult crowd and i think he gets credit for showing up and taking some very tough questions unlike the governor of florida or the president. >> i totally agree with you. he definitely gets credit for showing up. he knew this would be a totally hostile environment for him and