It’s possible to be in favor of a Constitutional, legal, open immigration policy and still be a conservative. Indeed, many libertarian economists—whose adherence to limited government and free enterprise is beyond question—argue that open immigration is the best and most small-government option.
That having been said, we should, as Milton Friedman said, make it impossible for immigrants to receive welfare.
Pay attention. If you give them the vote, they will put people like Bustamante and Villaraigosa in power and get welfare that way.
Amnesty = loss of America. Get it?