Here is the full text of Democratic Party presidential candidate Barack Obama's speech in St Paul, Minnesota.
Tonight Minnesota, after 54 hard-fought contests, our primary season has finally come to an end.
Sixteen months have passed since we first stood together on the steps of the Old State Capitol in Springfield, Illinois.
Thousands of miles have been travelled. Millions of voices have been heard.
And because of what you said - because you decided that change must come to Washington; because you believed that this year must be different than all the rest; because you chose to listen not to your doubts or your fears but to your greatest hopes and highest aspirations, tonight we mark the end of one historic journey with the beginning of another - a journey that will bring a new and better day to America.
Because of you, tonight, I can stand before you and say that I will be the Democratic nominee for president of the United States of America.
I want to thank all those in Montana and South Dakota who stood up for change today. I want to thank every American who stood with us over the course of this campaign - through the good days and the bad; from the snows of Cedar Rapids to the sunshine of Sioux Falls.
And tonight I also want to thank the men and woman who took this journey with me as fellow candidates for president.
At this defining moment for our nation, we should be proud that our party put forth one of the most talented, qualified field of individuals ever to run for office.
I have not just competed with them as rivals, I have learned from them as friends, as public servants, as patriots who love America and are willing to work tirelessly to make this country better.
They are leaders of this party, and leaders that America will turn to for years to come.