The US should have left the UN many, many years ago. There is still time.
A few years without the dues the US pays, and they may decide it is not a good idea to vote against everything the US wants just to defy us.
I believe we are behind in paying our UN dues [which is fine by me].
http://www.reuters.com/article/2010/10/14/us-un-usa-idUSTRE69D67220101014