Usually, after searching for a while, I can identify almost any bird. This is an exception. It is apparently a non-native to the United States and doesn't come up on any of the common bird lists. One thing I do know, that you can always find someone who knows almost everything on the Internet. So how about some help? Please leave a comment if you know what this is.
Later: Commentators responded: it is a Black-necked Swan, Cygnus melanocoryphus from South America. Not a local bird.