Nearly one in 10 superdelegates who voted in the Democratic presidential primaries were registered lobbyists, according to a new report, adding some support to Bernie Sanders's claim that "the system is rigged."

At least 63 of 712 superdelegates were registered at some point as lobbyists on the state or federal level, according to an analysis conducted this year by the nonpartisan, nonprofit Sunlight Foundation.

These individuals represented interests that span across big banks, healthcare insurers, the telecommunications industry and unions, including Goldman Sachs and Planned Parenthood.

The list includes former Senate Majority Leader Tom Daschle, who is currently registered for the healthcare insurance company Aetna, former House Minority Leader Richard Gephardt, a registered lobbyist with the Gephardt Group and former DNC General Chairman and Pennsylvania Gov. Ed Rendell, who was registered for Ballard Spahr LLP as recently as 2012.

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