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Senator Harkin is widely regarded as a friend of people with disabilities and one of the principal architects of the Americans with Disabilities Act. This blog article makes that case.
Here is Senator Harkin's official website. This website provides some information on his voting record. This site contains additional biographical information beyond that on the link of the first mention of his name above. This is his Facebook page.
We do know that Senator Harkin was recently a cosponsor of a bill to fully (40% of excess costs) fund special education. Here is a report on that bill. This development is very encouraging.