Barack Obama has the easiest and at the same time the hardest job of any leader in recent history, possibly since WWII. He can use all the goodwill and support that we can give him.
At one level, his new job is stupidly easy. Obama could be anywhere from a grey centrist-conservative like Bill Clinton all the way to a towering historical figure like Abraham Lincoln, and in any case the world will be delighted. We are all just so happy we got rid of George W. Bush. Just by being elected, Obama has already delivered what the world expected of him, and he has his entire presidency ahead of him to use as an opportunity. That doesn’t happen often.