I think we conservatives have to follow the Reagan example: change the party from within--but do not abandon her. Reagan was out in the cold for decades as a true conservative, while the Rockefeller/Nixon/Ford wing of the Republican party ran things. But Reagan eventually prevailed, and America prospered beyond anyone's expectations.
If we conservatives bolt the Republican party because of the current lack of conservatism in party leadership, we give the nation over to Democrat Liberals and Rockefeller Republicans. That would be awful.
I hope conservatives will stick it out and do the slow, long, hard work of reforming an electable party.
Bush has always favored what could be called an open border and in truth it isn’t that different from what Reagan supported when he signed Simpson-Mazzoli in the mid 1980’s. We need to defeat the current attempt at “fast track” legalization by keeping the pressure on those Senators and Representatives that tip the balance. The ONLY hope we have of preventing it in the next administration is by electing a Republican Conservative like Thompson, Hunter, or Romney(?) that will veto any attempt at this type of “reform” in the near future.