I think you're confusing the Peace prize with the other categories, for example the Nobel Prize for Chemistry etc. I think there are five prizes in all, the peace prize being the most vague.
Obama's win isn't really that unusual considering many of the previous winners, many politicians and a couple Presidents have won it before.
Generally the award doesn't mean a whole lot, although of course its hugely publicised and politically powerful.
Obama's international policies especially and attitudes towards Europe are very much in line with the President of the Norweigen Committee (those who decide the awards) who is also the President of some international socialist party crap. He obviously sees Obama as a political ally.
In Norway itself many of the political leaders have demanded his resignation but in reality Obama's win is no worse than Kissinger's and a host of others.
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