Latest News Wires Obama campaign adjusts strategy after debate (+video)

Republican presidential candidate Mitt Romney had a spring in his step Thursday following the presidential debate in Denver. President Barack Obama retains a slight lead in the polls as he awaits Friday's job numbers. 

AP Photo/David Goldman

A day after a muted performance in a presidential debate, U.S. President Barack Obama fought back against Republican rival Mitt Romney on Thursday and the Democrat's re-election campaign vowed to learn lessons from the setback.