Dan Osborn, the Nebraska independent Senate candidate presenting himself as a political moderate in the deep-red state, is getting a late boost to his campaign from liberal megadonors, dark money groups, and PACs, campaign finance disclosures reviewed by the Washington Free Beacon show.

Osborn, running against Republican incumbent Deb Fischer, is backed by Washington, D.C.-based PAC Retire Career Politicians, which has spent hundreds of thousands of dollars on ads that urge Nebraskans to "vote independent for U.S. Senate." But the group itself is far from independent, having raised nearly $2 million in September alone from prominent liberal donors and groups.

Hedge fund executive Donald Sussman, for example, sent the PAC $100,000 on Sept. 20, records show. One day earlier, Retire Career Politicians received $15,000 from self-described university student Phoebe Gates, the daughter of liberal billionaire Bill Gates.

The bulk of the group's September haul, however, came from liberal nonprofits and political groups, some of which don't disclose their donors. One such group, the Sixteen Thirty Fund—a well-known entity within the Arabella Advisors dark money network that funneled more than $60 million to liberal causes in 2020—gave $300,000.

Other shadowy entities that bankrolled Retire Career Politicians are less prominent. The Free Beacon compiled information on those groups below:

Organizing Empowerment Project

Global Impact Social Welfare Fund

Movement Voter Project

Sussman, Sixteen Thirty Fund, Organizing Empowerment Project, Global Impact Social Welfare Fund, and Movement Voter Project did not respond to requests for comment. Gates could not be reached for comment.

Though Osborn has presented himself as a centrist, he began his campaign by joining forces with consultants and firms openly associated with the Democratic Socialists for America, the Free Beacon reported.