The fact that Sanders characterized Bill Clinton’s escapades in such a way tells me that he knows that he can pick up some votes. This story will spread across the net. I saw a poll yesterday that has Trump 3 points ahead of Hillary whereas last week he was several points behind. At least some of that swing is related to his willingness to go head to head with the Clinton machine, and so far he is winning that battle. None of the other candidates would have even dared open their mouth about Bill Clinton.
The Clinton did a shivv attack on Sanders’ family so he was responding. They got a little money through the Sanders campaign. Of course, it was basic toliet paper money for the Clinton’s.