"Some viewers defended Clinton by saying that the clip had been edited, but it was not. The footage was taken from a speech Clinton delivered during a campaign stop in Omaha, Nebraska, on 1 August 2016.
Given the context of her statement and the audience's positive reaction to it, it appears that Clinton actually said "we aren't going to raise taxes on the middle class," but either she didn't fully enunciate the ending of the word "aren't" or the word didn't come through clearly on the audio recording (or both). Worst case, she simply misspoke and said "are" when she meant "aren't," because she has not announced any changes to her tax platform or said on any other occasion that she plans to raise taxes on the middle class and not the wealthy."
FWIW.........Closed Caption "heard" ARE. Granted, probably misspoke, but still funny.
http://www.snopes.com/2016/08/04/hil...n-raise-taxes/