It is extremely hard to understand why Bush keeps pushing the Senate amnesty bill or any variation thereof. If there is any political benefit in passing such a bill I do not see it. The next elections in 2008 are going to be disastrous for incumbents if this monstrosity passes, perhaps on both sides of the aisle if polls are any indication of the public mood.
Plenty of Republicans are dumb enough to believe that amnesty will secure the Hispanic vote, never mind that Hispanics have never been a swing vote (Reagan in '84 and Bush in '04 received no more than approx. 35% of the Latino electorate, and those were high-water marks for the GOP) and that Hispanic Republicans are overwhelmingly anti-amnesty.
The La Raza Republicans are looking forward to that which comes after they leave Congress - appointments to cushy jobs like judgeships and ambassadorships offered by Bush or a Pres. McCain or Giuliani, or lobbyist jobs offered by the business interests demanding cheap labor. For instance, if Chuck Hagel is ousted, look for him to become a lobbyist for the meatpacking industry.
The La Raza Republicans have heard an earful from their constituents when they've gone out among normal people. The opinions they really care about, however, are those of their cronies at the country club.