Former U.S. Sen. Bob Dole, his 89-year old body now weakened by age, illness and war injuries, sat quietly in a wheelchair on the Senate floor Tuesday, watching the debate over a United Nations treaty on the rights of the disabled.

He may have recalled an earlier time.

More than 43 years ago, Dole delivered his first speech on the very same floor — on disability rights. Later, as one of the most powerful members of the Senate, he pushed through the Americans with Disabilities Act, a measure designed to protect citizens grappling with accidents and disease.

Now he had come the Senate floor, perhaps for the last time, to persuade lawmakers to adopt a treaty supporters said would extend disability protections around the world.

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