Hillary Clinton of New York won the June 3, 2008 South Dakota Democratic Primary with 55.35% of the statewide/at-large congressional district vote while Barack Obama of Illinois received 44.65%.
John McCain of Arizona easily won the June 3, 2008 South Dakota GOP Primary with 70.19% of the statewide/at-large congressional district vote while libertarian-leaning Ron Paul of Texas finished in second place in the state/congressional district with 16.52%.