I'm in the quick service restaurant business. We hire a lot of Hispanic employees/managers, but require them to be legal. I have three stores around DC in a heavy Hispanic populated area. With three locations, we had two associate request offs (honored) and all the managers worked. I saw plenty of Hispanic customers at two locations and sales were up vs. last Monday. So I have to say there was no effect whatsoever in my spots in the DC market.
I guess the folks here illegally, working under the table have a different experience.