link to NY Times article on Obama IL voting record:

http://www.nytimes.com/2007/12/20/us/politics/20obama.html?pagewanted=all&_r=0


on the federal level via opencongress link here:

http://www.opencongress.org/people/voting_history/400629_barack_obama

or you can plow through the relevant volumes of the Congressional Record... more than I can handle myself.

the hardest thing is to verify a non-partisan relatively objective source.