President Barack Obama

People watch a large TV screen in a park as U.S. President Barack Obama speaks after accepting the Nobel Peace Prize in Oslo December 10, 2009. The United States must uphold moral standards when waging wars that are necessary and justified, Obama said on Thursday as he accepted the Nobel Prize for Peace. In a speech at the award ceremony in Oslo, Obama said violent conflict would not be eradicated "in our lifetimes", there would be times when nations would need to fight just wars and he would not stand idle in the face of threats to the American people.