Two statewide elections took place in 2006. In the U.S. Senate race, State Treasurer Bob Casey, Jr., son of former Governor Bob Casey, Sr., won nearly 59% of the vote, defeating incumbent Republican Rick Santorum. Santorum's margin of defeat was 18 points—the largest for an incumbent Republican Senator in state history. Casey also became the first Democrat elected to a full Senate term from Pennsylvania since Joseph Clark was re-elected in 1962. In the gubernatorial election, incumbent Democratic Governor Ed Rendell won a comfortable re-election over Republican challenger Lynn Swann. Rendell took 60% of the votes cast, while Swann took the remaining 40%.