dr. ben carson fighting back against those calling his credibility into question. carson saying the intense scrutiny reflects how seriously his opponents republican and democrat are taking him today. >> to the progressive, the secular progressive movement in this country, they can look at the polling data and see i'm the candidate who is motor likely to be able to beat hillary clinton. they see that. bill: he's saying he's a threat and that's why he's getting so much blowback. >> the carson campaign believes they weathered this storm. i spoke to their campaign manager. he says they have seen a spike in contributions. raised $4 million this month. 80,000 new contributors who have