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And that's what nobody knows. donald trump has a solid 25% to 30% of the vote. i know it's higher in some polls, a little lower. that's about where it is. the question is, as his base gets stronger, does he drive potential voters for him away who might come to him later? he's doing well in a field of 14. republican leaders are gambling. when the field dwindles, that his support will be less meaningful. >> third party run, is it possible he could win as a third party candidate? you know the math. explain the math and if this could ever work. >> the system doesn't really -- isn't really set up f...

-- step to their own success. >> joining us is cnn senior political commentator and former senior adviser to president obama, david axelrod. thanks so much for being here. the more the gop attacks donald trump, the more his supporters dig in and like him and support him. >> absolutely. the essence of his appeal is that his anti-establishment, he's appealing to people who are very angry about what's going on in washington. they think the republican party has been a part of that. and so, yes, he will use this to his advantage. >> i mean, they feel abandoned by what was previously their party, mo...

>> i think it's a very awkward two-step they're trying to perform. jeb bush is calling him unhinged. you have the chairman of the party saying it's unamerican what he's saying, then they ask would you support him? of course. they don't want to alienate the base of vote her support him, sort of theç old base. >> they hear you saying they're wrong to be afraid. >> i think fear is not just limited to them. i've said to my own party and to others that you can't go after fear mongers if you're not going after the fear. you have to address the fear. and i think that's good advice for both parties....