The arena erupted in jubilation, with many people brought to tears by the sight of the first African-American being nominated on a major party ticket.
"I went through segregation and desegregation," said Gail Conner of Edgemont Twp., Pennsylvania. "I can't explain it to you. It's moving and I just praise God for it."
Some of Pennsylvania's best-known delegates even weighed in.
"The game is over. Obama won. We are going to the big game. I can't wait to be a part of that," said former Pittsburgh Steeler Franco Harris.
There was even a sense of renewed optimism as the thought of an Obama-Biden ticket sunk in. Once again, Governor Ed Rendell praised Obama's choice of Sen. Joe Biden as a running mate.
"I think he brings a tremendous experience to Senator Barack Obama's ticket, his background with foreign relations and policy definitely helps to stabilize and strengthen the ticket," said Governor Ed Rendell.