Washington (AP) Barack Obama has effectively clinched the Democratic presidential nomination.
Based on an Associated Press count of convention delegates, Obama has enough delegates to become the first black candidate ever to lead his party into a fall campaign for the White House.
The AP count is based on public commitments from delegates, and more than a dozen private commitments.
It also includes a minimum number of delegates that Obama will win even if he loses today's final two primaries, in South Dakota and in Montana.
Obama has campaigned on a call for change, outlasting Hillary Rodham Clinton in a historic race that brought record numbers of voters to the polls in primaries.
The 46-year-old first-term senator would face John McCain in the fall campaign to be the 44th president.