President Barack Obama accepted the Nobel Peace Prize today in Oslo, Norway – after ordering 30,000 troops into Afghanistan less than 10 days ago. In his acceptance remarks, the Commander-in-Chief laid out a philosophy that reconciled what critics called a contradiction. Peace, he said, sometimes must be achieved through violence. "Yes, there will be engagement. Yes, there will be diplomacy," he said. "But there must be consequences when those things fail." So tonight we ask: Do you agree? Tell us what you think. You can follow "Nightline" anytime on Twitter: http://twitter.com/Nightline.