Will Mexican Absentee voting hurt Latinos and fuel anti-immigrant sentiments?

Tom Elias, writing in the Pasadena Star-News, speculates that the spectre of millions of Mexican immigrants waving Mexican flags at rallies for PAN and PRI could end up fueling anti-immigrant sentiments by American citizens.

I raised the intriguing possibility a few days ago, where foreign parties will be organizing large campaign rallies in American cities. I find it an interesting sociological and political phenomenon, but this is the first time I've seen a suggestion that it may be harmful to Latino interests in the US.