Illegal immigration reality check

Celebrating a Day Without a Mexican
Is there a progressive case to be made for illegal immigration? Not that I care, but I notice a few d-bags in the comments here have made it a point to suggest that being against illegal immigration is some sort of conservative argument. I wonder if they're just being disingenuous or if they're really that dumb.
Of course my money is on the latter.
From what I can gather, the best argument to be made in favor of illegal immigration, from a progressive standpoint, is that most illegal immigrants are hispanic, and therefore if you're against illegal immigration, then that makes you a racist. Correct me if I'm wrong, but then you bags have already had months now to put forth a better argument.
Here's the case against illegal immigration - mind you, from a left/liberal whatever you want to call it perspective:
Illegal immigration, as it exists in America today, only serves to shift money from the pockets of poor Americans and into the pockets of the already uber wealthy elite. While it's true that the illegal immigrants themselves stand to make more money than they would in Mexico, to use an example, this is the same reasoning used to defend corporations who run sweatshops in third world countries.
Indeed illegal immigration in the US, as an issue, shouldn't be viewed as any different than the issue of sweatshops in third world countries. While it's true, we can presume, that some 13 year-old girl in Malaysia can make more money sewing Air Force Ones than she can having sex with sailors and what have you, this is hardly a reason to be in favor of sweatshops.
In the long run, Malaysia is still going to be a world class shit hole, that pair of Air Force Ones is still going to cost $100 for the black kid in the US dumb enough to buy them, and the only people who will have benefited are the rich d-bags that own Nike.
If there's a difference between sweatshops off in Asia somewhere and illegal immigration here in the US, it's that the jobs performed by illegal immigrants here in the US don't lend themselves as easily to sweatshops in foreign countries. It's more feasible economically to pay someone $3 to pick lettuce here in the US than to pay someone in Malaysia $.03 and then have to ship it, what with gas prices and all.
Of course the rub is that a head of lettuce isn't going to cost any less than it would if some American citizen was paid $8 to pick it. That extra $5 or whatever goes right into the pocket of the bags that own whatever company it is that makes lettuce. Maybe some Mexican makes $1 more than he would otherwise, but there is no net benefit for the vast majority of the population.
Transferring wealth from the hands of the poor into the hands of the rich is the very antithesis of progress. Being against illegal immigration is the "right" side of the issue, regardless of what you think about Mexicans. Personally, I think they stink; but like I said, that's neither here nor there.

