Largest Occupy Wall Street Donor Is Mitt Romney Backer Retired Wall Street trader and former Mercantile Exchange VP Robert Halper gave $20,000 to help launch Occupy Wall Street. He is also a backer of Mitt Romney. But for what its worth, Halper seems to agree more with the protesters than with Romneyhe says that pain should be shared and people who have money should pay something more, whether thats in taxes or somewhere elsethough the Times says hes ambivalent about Occupy Wall Street in general. Even so, hes been down in Zuccotti Park every day talking to people. Its the coolest place in New York, he says.