Erik Voeten looks at how the UN and the US have diverged:

The graph above plots the ideal points of the United States and the average ideal points of states in various regions of the world (as defined by the United Nations) based on their votes in the U.N. General Assembly. This is essentially the same thing as estimating how liberal or conservative senators are based on their votes in the Senate. …

The picture does not look pretty for the United States. There is a massive gap between this country and everyone else, and this gap seems to be widening steadily rather than closing. Obama may have moved a little bit toward the center of the space, but not much. And there is no evidence that other states have gravitated toward the U.S. position.