This is definitive proof by a professor of Political Science at Wayne State University. Also, the number one example that she displayed to us in class was the members of the legislature in committee. If you watch current committee hearings compared to pre-term limits committee hearings the questions being asked of bureaucrats are a whole lot tuffer and a whole lot more technical. A good example of this is the committee hearing to deregulate the energy companies in Michigan. Prior to term limits the same bureaucrat was not able to pull or push the legislature to do anything that he wanted without definitive reporting and proof. Following the election of a majority legislature of freshman, the same bureacrat was able to slide anything he wanted into the committee hearing without objection from the chair.
The data in this book is enough proof for anyone that term limits have failed.
http://www.amazon.com/Political-Institutional-Effects-Term-Limits/dp/1403965145