Gary Jacobson
Here are the files.
The non-obvious codes are State (1 [Alabama] to 50 [Wyoming] in strict alphabetical order--not the mail codes) and
Month (1 to 18, beginning May 2005 and ending October 2006). You can combine the months as you wish.
In the original PSQ paper, I had data only through January 2006, so there is a lot more here.
For the Governor set, the party breakdowns for September and October 2006 have not been entered.
They are available (with some tedious downloading work on your part) at the SurveyUSA website