The South Dakota Primary was held on June 3, 2008. Hillary Clinton was declared the projected winner very soon after polling booths closed.

Despite her victory, Barack Obama took the nomination after receiving the endorsement of several uncommitted Superdelegates.

Clinton was widely expected to drop out and back Obama in his quest for the presidency on June 3.

However, in a speech made in New York after the South Dakota results were projected she made no such concession. She said she would be making "no decision tonight" on the future of her campaign. Her words came after many news outlets were openly discussing Obama's victory and Obama himself declared himself the Democratic nominee soon after.

The South Dakota primary formed part of the last two Democratic Party primaries in the 2008 Primary calendar.

Early polls placed Barack Obama in the lead. However, following a landslide victory in Puerto Rico, the Hillary Clinton Campaign announced that they expected a much closer race.