There's not much room to move, which is typical at a national political convention, but the floor is also much smaller than we've seen with recent conventions. In fact, the fire marshal has closed off any further access because of safety concerns.
Biden has made a number of comments to fire up the crowd in advance of President Barack Obama's address, including one he's repeated a few times in recent speeches.
"Osama bin Laden is dead, and General Motors is alive!" Biden said with great enthusiasm, drawing loud cheers from the thousands of people packed into the arena.