EDIT:

Someone pointed out that I had originally linked to his campaign announcement video for the previous election. Oops....

Here is the video for his campaign announcement for the current election: https://www.youtube.com/watch?feature=youtu.be&v=s7DRwz0cAt0&t=4m47s

In this video, he just makes a vague statement to "provide pay equity for women" without giving a specific statistic for what he is referring to. But on his Senate website, he references the debunked 78 cents on the dollar pay gap statistic again: https://www.sanders.senate.gov/legislation/issue/womens-rights

https://www.youtube.com/watch?v=fL12Gb_ixtU&t=20m48s

Further, we must establish pay equity for women workers. It is unconscionable that women earn 78 cents on the dollar compared to men who perform the same work.