Barack Obama declared victory Tuesday night at a raucous rally at the Xcel Energy Center in downtown St. Paul.
"Tonight, after fifty-four hard-fought contests, our primary season has finally come to an end," he told thousands of supporters who had jammed the arena to witness an historic moment as Obama became the first black candidate in the nation's history to become a major party presidential nominee. The crowd of 17,000 exploded in an ear-splitting roar.
"Tonight, I can stand before you and say that I will be the Democratic nominee for president of the United States," he said, setting off another roar even louder and longer.
An additional 15,000 supporters watched the speech on a big screen outside the arena, according to fire officials.
In prepared remarks, Obama praised his vanquished rival, Hillary Rodham Clinton, and took direct aim at John McCain, the Republican he will face in November.
"Senator Hillary Clinton has made history in this campaign not just because she's a woman who has done what no woman has done before," he said, "but because she's a leader who inspires millions."
Of McCain, Obama said that he respects "his many accomplishments, even if he chooses to deny mine. My differences with him are not personal; they are with the policies he has proposed in this campaign ... There are many words to describe John McCain's attempt to pass off his embrace of George Bush's policies as bipartisan and new. But change is not one of them."
Directing his words beyond the hall to a national audience, he declared: "America, this is our moment."