The largest known giver to a controversial charity founded by U.S. Sen. Rick Santorum made its $25,000 donation as the senator was working to win as much as $8.5 million in federal aid for the donor’s project in the Philadelphia suburbs. Federal tax records show that Preferred Real Estate Inc., the developer of the Wharf at Rivertown project in Chester, Pa., wrote the check to Santorum’s Operation Good Neighbor Foundation in 2002. On his campaign Web site, Santorum boasts of winning $8.5 million in federal aid for the riverfront redevelopment of an abandoned Peco Energy plant — an effort that...