Bush has always been pro immigration. Go back and read some of his speechs from both 2000 and 2004. You will never get everything you want in a candidate. I voted for Bush knowing his views on immigration was differed from mine.
This isn't a policy difference like, Should the top marginal tax rate be 40% or 42%. An amnesty would be a DISASTER for this country, and relegate the Republican Party to permanent minority status.
Donning my tinfoil hat, did Dubya blow this election intentionally in order to get a congress that would pass his amnesty plan?