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Jim Lehrer discusses the Iraqi resistance and rumors of a U.S.-ordered lull in the advance toward Baghdad with retired Colonel W. Patrick Lang and retired Colonel John Warden.

Coalition troops have met fierce resistance from Iraqi military and paramilitary forces as they push north toward Baghdad. Gwen Ifill discusses the roots of that resistance with profesors Ahmed Al-Rahim and Rashid Khalidi.

Smoke continued to billow out of Baghdad Friday after U.S.-led forces unleashed the heaviest bombardment of the Iraqi capital in days, using B-52 bombers to drop two 4,700-pound, satellite-guided "bunker-busting" bombs on Iraqi targets.