Without a desk between them, the candidates approached each other on stage at one point during a discussion on energy.
As Romney answered a question on gas prices and oil drilling, Obama stood up and moved toward his Republican challenger. Romney turned to the president's direction and they quarreled as they stood only a few feet apart.
At one point, Obama sharply rejected Romney's arguments, saying, "Not true, Gov. Romney."
When Obama interjected with his energy positions, Romney responded, "You'll get your chance ... I'm still speaking."
(Copyright 2012 by The Associated Press. All Rights Reserved.)