I'd start by referring you to google, to research that actual powers of the Texas governorship.
Texas Governors have virtually no power. They mostly make appointments to boards and commisions, and ride around in parades. It's reputed to be constitutionally, the weakest governorship in the nation. A figurehead almost.
The Texas State constitution disperses almost all the budgetary and legislative powers among other independent state wide elected officials. Who may or may not even be in the same political party as the Governor. In fact, the Lieutentant Governor has more power than the governor in the legislative and budgetary process.
So I would challege you that Bush had really anything to do with this.