From NBC/NJ's Athena Jones
DENVER, Colo. -- Barack Obama surprised the crowd in the convention hall Wednesday night, appearing on stage after running mate Joe Biden's speech.
"Hello, Democrats!" he shouted to applause. "I want everybody to now understand that I am so proud to have Joe Biden and Jill Biden and Beau Biden and Mama Biden and the while Biden family with me on this journey to take America back."
Moments before the senator took the stage, volunteers passed out "Obama-Biden" signs. A roar went through the hall as he entered and people scrambled to snap photos.
He praised the Delaware senator for his speech and again complimented his wife and his former rival Hillary Clinton, as well as Bill Clinton, who spoke earlier in the night
"I think Pres. Bill Clinton reminded us of what it's like when you've got a president who actually puts people first," he said. "Thank you Pres. Clinton."
Obama closed by saying the convention was moving to Mile High Stadium to "make sure that everybody who wants to come can join in the party and join in the effort to take America back."
Afterwards, "We are Family" played as Biden's family joined Obama and Biden on the stage.