U.S. signature absent from U.N. disability convention, celebrated at Paralympic Games

Summary: The spotlight is shining on the United Nations Convention on the Rights of Persons with Disabilities at the Paralympics taking place in Sochi, Russia. But the U.S. is one of a handful of countries around the world that have not ratified the treaty, despite it being based on the 1990 Americans with Disabilities Act. Judy Woodruff reports.