Links to government sites where I got this information:
http://www.treasurydirect.gov/govt/reports/pd/mspd/mspd.htm
http://www.bea.gov/national/nipaweb/TableView.asp#Mid
The debt to GDP ration is simply indicative that it should have been much easier for Bush to balance a budget or (gasp) have a surplus than Clinton. It is also a reflection of how Clinton did it: by stifling the economy with taxes.
Bush did the RIGHT thing by following Reagan: lower taxes. However, he did the wrong thing by not controlling spending.