Barack Obama celebrated his victory in the Democratic presidential candidate race by playing a U2 track.
The Irish rock band's 'Beautiful Day' played out over the speaker system as Obama took to the podium in front of 15,000 people at the Excel Energy Center in St. Paul, Minnesota.
"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," he said.
Obama will run for the presidency this November. The Illinois senator will be the first black person to lead a major US political party in a presidential race.
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