Barak Obama was named the 2009 Nobel Peace Prize laureate nine months after his inauguration. Subsequently, he used a drone to murder an American citizen, among a litany of other atrocities.
Best thing Obama did was pulling out of Iraq, finally leaving an illegal war, so hats off for that. But all his talk about envisioning a world free of nuclear weapons and then not even attempting disarmament of the US ones kinda seems weak.
Kudos to Obama for actually following through, but the withdrawal from Iraq had a deadline set by the U.S. Status of Forces Agreement signed by Bush, per the request of the Iraqi government.
Nobel Laureate is a bit of an overstatement but she was part of an organization that won the Nobel Prize, similar to how Amnesty International has won it a few times:
She was a contributing author to the 2007 IPCC report, maybe not a huge deal (there were 100+ authors) but it is reasonably relevant. Here is a chapter that she contributed to (I don't know if there is more than one) and her earlier work is cited.