The Nobel Prize nomination committee is politically influenced.
Political correctness tends to be a theme with several winners. How can someone like Mahatma Gandhi, who used a nonviolent method to deliver independence to India, not be awarded? Meanwhile, Al Gore and the IPCC are handed the prize when their research is still not considered conclusive in many circles (and yes, global warming is still only a hypothesis, not a theory or fact by even their own scientific standards and definitions). The funniest yet saddest in my opinion is when they gave it Jimmy Carter for his peacetime efforts. The reason why I think his award is outright wrong is that the collapse of Iran to radical muslims took place under Carter's watch . . . and Jimmy did not raise a finger to prevent it from happening. If Carter had helped the Shah of Iran, you would NOT have seen the rise of both the Ayatollah Khomeini and Saddam Hussein, the Iran-Iraq War, the invasion of Kuwait, the first Gulf War, Operation Desert Fox, the second Gulf War, etc. In other words, it was Jimmy Carter's inaction that took us down the road that caused far more political, military, and social conflicts than anyone would care to admit.
Politics play a heavy role in the awarding of this prize. Look at the fact that Mikhail Gorbachev wins the prize because he helped bring the Cold War to an end. The problem is that Ronald Reagan was truly instrumental in ending the Cold War by forcing Mikhail to the table. In fact, without Reagan, the USSR would have held their course through the Cold War. Reagan was far more responsible for the end of the Cold War than Gorbachev, but the Nobel committee honors Mikhail over Ronald completely. Once again, take a look at Carter who was practically detrimental to America's efforts during the Cold War.
There are others who have won that have either less than stellar records or are just thrown in to enhance an agenda supported by the committee. The list includes the IAEA with Baradei, Yasser Arafat, Kofi Annan (a.k.a. Saddam Hussein's UN backer), and the United Nations itself (a number of times).
This is not to say that there are those who do deserve the honor, such as those who wholly fight for human rights and truly stand for peace. Still, politics will remain a constant in the nomination and awarding process and that will leave a terrible mark on the institution.