In this Jan. 22, 2006 file photo, balloons rise into the Colorado sky over Invesco Field at Mile High in Denver at a Denver Broncos game. Barack Obama will accept the Democratic presidential nomination before up to 76,000 people at Invesco Field instead of the smaller Pepsi Center where the rest of the convention will be held, party officials said Monday, July 7, 2008. (AP Photo/Bill Ross, file)

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