I've seen that story before. And I have no reason to doubt it. But I don't think it will stick. Among the left, Sanders looks much more ethical than Hillary, even with that story dogging him.
And another point to consider is that Sanders has declared a net worth that is very low, among the lowest in Congress. So either he's not on the take, or he's very good at hiding the take. I see him as a relatively honest goofball, completely unfit to run any organization. But I suppose he'd make an honest clerk in some office somewhere.
Hillary on the other hand I would not trust to take out my garbage.
http://www.redstate.com/2015/03/27/bernie-sanderss-wife-involved-real-estate-scam/
For driving the college into near bankruptcy with a fraudulent loan application, Sanders received a severance bonus of $200,000.