Afghan President Hamid Karzai's main election challenger said Sunday that he will withdraw from a planned Nov. 7 runoff, casting new doubts on the legitimacy of the Afghan government as the Obama administration debates U.S. strategy in the region.

Lahore, generally considered Pakistan's cultural hub, has experienced several terrorist attacks this year, which has put the city on edge. Secretary of State Hillary Clinton visited the city Thursday and promised more U.S. assistance. Margaret Warner provides an on-the-ground report.