Bush punted it into the next administration but notified Perry that Texas would be out of conformance when the next prez implemented it.
Perry and the TX GOP knew Democrat Mayor White would be running for higher office so they decided not to do anything and use it as a campaign issue against White.
Then in Dec 2010, after White had lost the election for Texas Gov, Perry decided to continue using the issue for campaign reasons.
Because of this, we have known since Dec that Perry would likely run for prez.
It’s a STRONG issue to run on.