At the moment, so-called liberals whatever reason are more concerned about ILLEGAL immigrants than legal immigrants.
Do you know how many legal immigrants' green cards got delayed the last time there was an amnesty program for illegals? Do you think the US govt. will hire more immigration dept. workers if illegals start getting legalized. They don't even hire people in the patent office! Every legal immigrant in the green card queue hopes that an amnesty program won't get passed until he/she gets the green card.
IMHO, there are practical reasons why gdilla is concerned about illegals getting preferential treatment.