ABC NEWS EXCLUSIVE: Sanders Pulls Negative Clinton Ad

After promising a positive campaign, senator calls digital ad "a gray area."
0:25 | 12/15/15

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Transcript for ABC NEWS EXCLUSIVE: Sanders Pulls Negative Clinton Ad
That you never attacked politically in this weekend's. Let's that such an pocketed Wall Street experts. There's not a lot further study is your question or you're looking at somebody who has never run. In negative TV in his life and never will. There are sometimes there gray areas we felt that it was breeder we took the now we are running a positive campaign and you ask any other candidate out there. If they've ever on negative television ads don't wanna hopelessly I have like you.

This transcript has been automatically generated and may not be 100% accurate.

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