He listed off a whole string of them, from college through the State Department.

The most obvious ones:

The Children's Health Insurance Program

The health care initiative, which would have become a national single-payer system if they could overcome a senate filibuster; and the plan in the 2008 campaign, which eventually became a closer blueprint to Obamacare than even Obama's plan.

The Copenhagen Climate summit, the first ever time that China and India agreed to rules on carbon pollution.

Funding for first and second responders after 9-11. (probably not a hard sell in that climate, but points are points)

Small business initiatives throughout New York State. I lived in Ithaca while she was in office and this was a big deal for the upstate and rural areas.

The sanctions regime on Iran that eventually forced them into the nuclear deal.

This is just what comes to mind off the top of the head. Bill also mentioned a bunch of other things that aren't as well known, like her founding of the Arkansas Advocates for Children and Families, a non-profit advocacy group that's still active today, or her work collecting evidence to force desegregation of schools.