It's ok to say "I don't know".
Obama Awarded 2009 Nobel Peace Prize
It sounds like to me they gave him the prize because he's popular. Kind of like a yearbook superlative or the Heisman Trophy. I don't know that he's actually done anything to deserve it yet.
President Obama was awarded the 2009 Nobel Peace Prize on Friday.
The first African-American to win the White House, Obama was praised by the Norwegian Nobel Committee for "his extraordinary efforts to strengthen international diplomacy and cooperation between peoples."
None the less, congratulations Mr. President!