Obama joins Biden on the Pepsi Center stage Wednesday night. Watch video above.
Comes after the vice presidential candidate's speech, where he casts doubt on McCain's national security claim to the presidency.
"The choice in this election is clear. These times require more than a good soldier – they require a wise leader. A leader who can deliver change. The change everybody knows we need."
Also spends time talking about his blue-collar background, courts the working class and criticizes McCain.
Watch video here and read full remarks here.
Plus: Watch the video that introduced Biden.
McCain camp responds: "Joe Biden is right: We need more than a good soldier, we need a leader with the experience and judgment..."
