This treaty is meant to bring our standards for the disabled to other countries. It isn't supposed to do anything to our own laws. It's about making the world an easier place to live for people with disabilities. The vote was for the US to agree to this treaty, basically put our stamp of approval on it. Shows us to be a bit ridiculous to not ratify a treaty that is largely based on our own laws.
President Bush supported this treaty, as did Senator John McCain. Why would senate republicans vote no on this? I really have no idea why they would choose not to ratify this, other than their need to go against anything the democrats do.