Ben Carson: I'm a threat to the secular progressive movement

GOP presidential candidate Dr. Ben Carson says that he is a "threat" to the "secular progressive movement."

BEN CARSON: I have always said that I expect to be vetted. But being vetted and what is going on with me, "You said this 30 years ago, you said this 20 years ago, this didn't exist, this didn't." You know, I just, I have not seen that with anyone else. Or if you can show me where that's happened with someone else, I will take that statement back.

CHRIS JANSING: I think almost every person who has been president would--

BEN CARSON: No, not like this. I have never seen this before. And many other people who are politically experienced tell me they've never seen it before either.

CHRIS JANSING: You don't think that Bill Clinton or the president with his birth certificate, people who still--

BEN CARSON: No, not like this.

CHRIS JANSING: Refuse to believe?

BEN CARSON: Not even close.

CHRIS JANSING: So what do you think is going on? Why you?

BEN CARSON: Because I'm a threat.

CHRIS JANSING: To?

BEN CARSON: To the progressives, the secular progressive movement in this country. I'm a very big threat because they can look at the polling data and they can see that I'm the candidate who's most likely to be able to beat Hillary Clinton. They see that.