"Alfred Nobel wrote that the prize should go to the person who has contributed most to the development of peace in the previous year," and President Obama was not in office the year previous to his nomination for the prize nor did he accomplish anything as Senator that made him worthy of this, once, presigious prize.
So to answer your question, Ghandi. And the poor soul is probably turning over in his grave right now, considering there were other nominees more worthy of this award than Obama, who won it for his promises. Since one of his promises was to do the right thing for the U.S. of America, Home of the brave, Home of the free, and another promise was to donate his $1.4 million prize to charity, the most charitable & right thing he could do is use every bit of that money to help pay back the national debt he helped create. Charity begins at Home