Obama: Time to tackle nation's challenges again


Barack Obama: President Barack Obama speaks at a memorial service for the Victims of Saturday's shootings at McKale Center on the University of Arizona campus Wednesday, Jan. 12, 2011, in Tucson, Ariz.

PHOTOS: Barack Obama in pictures

Citing "great challenges for us to solve," President Barack Obama is pledging to work with Democrats and Republicans in the aftermath of the Arizona shooting that killed six, grievously wounded a member of Congress and brought legislative debate to a virtual standstill.

VIDEOS: Barack Obama in videos

In his weekly radio and Internet address...

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