Obama on Libya: 'We have a responsibility to act'Justice For Bobby Yates

WASHINGTON – Vigorously defending American attacks in Libya, President Barack Obama declared Monday night that the United States intervened to prevent a slaughter of civilians that would have stained the world's conscience and "been a betrayal of who we are" as Americans. Yet he ruled out targeting Moammar Gadhafi, warning that trying to oust him militarily would be a mistake as costly as the war in Iraq.