The way I see it, the Dems want the illegals for the votes they will bring them. The GOP wants the illegals because their business constituency wants them. Nobody is looking at the big picture: the end of America as we know it. As we know from the firestorm that met the first call for amnesty, both Democrat and Republican rank-and-filers oppose it, so it’s just the party leadership trying to do this to us.
I would add to those groups the labor union leaders who want to increase membership; the Catholic church to boost church attendance; ethnic groups like La Raza that want more political power and leverage; the ACLU, which wants to destroy this country, and the Chamber of Commerce that wants a cheap, inexhaustible supply of cheap labor.