Obama gives Karzai ultimatum on U.S. troops in Afghanistan
President Barack Obama told Afghan President Hamid Karzai that the U.S. would start planning for pulling out all American forces by the end of the year, since Karzai will not sign a troop agreement. The top U.S. commander had recommended keeping 10,000 troops in Afghanistan for two years after 2014 if the Afghan government first signed the agreement. David Martin reports.