Someone who buys a fifty-story building downtown and then, well, arranges to buy and gets partners -limited partners--to join in financing it; that's the arrangement.
Obama also had the best-financed campaign in memory, using the Internet to solicit a large number of new donors and breaking a promise to accept limited public financing for the general campaign.
Repayment of the financing depends on the cash flows of the project (limited recourse project financing) rather than on the guarantees of other parties.