This applies to all of 'em, not just the illegal aliens (who are not, as it turns out, "immigrants" ~ calling them "immigrants" would be like calling a house robber a "guest").
Tan Nguyen's campaign's letter warned readers not to listen to politicians who might tell non-citizens that it's okay to vote, since those politicians are only looking out for their own interests. That was a very good warning.
Five months ago, in the primary or runoff election in San Diego for the 50th Congresional seat, vacated by Duke Cunningham and won by Brian Bilbray (R), candidate Francine Busby (D) told a Spanish-speaking audience otherwise:
"You can all help. [pause for Spanish translation] You don't need papers for voting. You don't need to be a registered voter to help," said Busby. This was in response to a question by a Spanish-speaking man who asked how to help get her elected but who did not "have papers." [meaning that he was in the US illegally]
Here's one of several threads. http://www.freerepublic.com/focus/f-news/1642545/posts