Updated 1:44 p.m. 3/8

David Koch, one of the nation's most generous underwriters of conservative causes, is among more than 250 donors chipping in to help disgraced former South Carolina Gov. Mark Sanford get his political career on track. So is Foster Friess, a conservative millionaire who bet heavily last year on former Sen. Rick Santorum's failed bid for the Republican nomination and made headlines with his unorthodox views on contraception.

Both gave $2,500 each to Sanford's campaign to win back the House seat that that he held in the 1990s, according to ...