President George H. W. Bush signed the Americans with Disabilities Act into law 20 years ago, today. Since then, we've almost come to take for granted many of the things it required: accessible public transportation, reserved parking, more frequent curb cuts, equal access to employment and education opportunities, and much more. To take stock of how much has changed, and how far we still have to go, John Hockenberry joins us, even though he's still technically on vacation. Hockenberry was paralyzed from the chest down in a car accident when he was 19.

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