CNN: Obama clinches nomination

WASHINGTON (CNN) -- Sen. Barack Obama has clinched the Democratic nomination for president, according to CNN estimates, making him the first African-American in U.S. history to lead a major-party ticket. Obama picked up a slew of superdelegate endorsements on Tuesday. Those endorsements, combined with the delegates he's projected to receive from South Dakota's primary, will put him past the 2,118 threshold, according to CNN estimates. Obama will claim victory during a speech in St. Paul, Minnesota, according to prepared remarks released by his campaign.