Changed how? By revising history to suit his needs? By lying to the world about the reason why Israel was established? By lying about how important the religio/political farse of a religion, Islam is in America? By lying about how many Muslims reside in the USA? By lying about being Israel's "friend" while all the time setting Israel up to be destroyed? By threatening deep distance between the the USA and Israel if Israel doesn't do what the USA wants? By taking Jewish votes and Jewish money and Jewish support based upon mostly one issue, the security of Israel (the big money anyway). Just why was he given this prize?
Israeli man wounded in stabbing in central Jerusalem; circumstances still unclear (Haaretz)
from the article: Obama is worthy of Nobel, he has changed the world