In this Feb. 1, 2012 photo, an ironworker works in the steel framework of a roof in the remodeling of a downtown hotel in Pittsburgh. The unemployment rate fell for the fifth straight month after a surge of January hiring, a promising shift in the nation's outlook for job growth. (AP Photo/Keith Srakocic)

Associated Press
In this Feb. 1, 2012 photo, an ironworker works in the steel framework of a roof in the remodeling of a downtown hotel in Pittsburgh. The unemployment rate fell for the fifth straight month after a surge of January hiring, a promising shift in the nation's outlook for job growth. (AP Photo/Keith Srakocic)
In this Feb. 1, 2012 photo, an ironworker works in the steel framework of a roof in the remodeling of a downtown hotel in Pittsburgh. The unemployment rate fell for the fifth straight month after a surge of January hiring, a promising shift in the nation's outlook for job growth. (AP Photo/Keith Srakocic)
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