Sen. John McCain, Arizona Republican, attends a news conference about the Convention of the Rights of Persons with Disabilities, Thursday, July 12, 2012, on Capitol Hill. (AP Photo/Jacquelyn Martin)

Photo by: Jacquelyn Martin

Sen. John McCain, Arizona Republican, attends a news conference about the Convention of the Rights of Persons with Disabilities, Thursday, July 12, 2012, on Capitol Hill. (AP Photo/Jacquelyn Martin)