Yes he has.....

During the first (8) eight years of his elected service he sponsored over 820 bills. He introduced:

233 regarding healthcare reform,
125 on poverty and public assistance,
112 crime fighting bills,
97 economic bills,
60 human rights and anti-discrimination bills,
21 ethics reform bills,
15 gun control,
6 veterans affairs and many others.

His first year in the U.S. Senate, he authored 152 bills and co-sponsored another 427. These included:|

**the Coburn-Obama Government Transparency Act of 2006 (became law),
**The Lugar-Obama Nuclear Non-proliferation and Conventional Weapons Threat Reduction Act, (became law),
**The Comprehensive Immigration Reform Act, passed the Senate,
**The 2007 Government Ethics Bill, (became law),
**The Protection Against Excessive Executive Compensation Bill, (In committee), and many more.