I suppose it was inevitable. Take an inchoate conservative movement and it will soon latch onto immigration. New American Media discusses how the Tea Party movement is taking on immigration, though as yet it has no unified view.
However, the organizer of the Tea Party convention praised Tom Tancredo's speech, in which he said the following:
"People who could not even spell the word 'vote' or say it in English put a committed socialist ideologue in the White House."
The racism there is obvious, given that literacy tests were long used in the U.S. to prevent African Americans from voting. And it is now merged into xenophobia into a single message: the poor uneducated and Latinos (sometimes one and the same) are destroying the United States.
The only bright side to this ugliness is that it does not play well amongst the general public, and is a loser electorally, so it will likely remain fringe despite the media attention. Some Republicans understand this--for all her gaffes, Sarah Palin has been careful not to ramp up immigration rhetoric.