I’m sure it depends on where one lives.
If assimilation were official government policy, in two generations there would only be a gnat’s ass difference between the bulk of both groups. And from that, as long as there are economic opportunities, a similar political breakdown as exists among the broader American populace (40% conservative 30% moderate 20% liberal 10% clueless).
I understand that the heritage of most Mexican illegals is Amerindian from lower classes (Mexicans like the Germano-Basque Vicente Fox are doing just fine over there), but many are mixed and have already become more American than not (see even George Lopez, for example). By the 2nd or 3rd generation, most will not even speak Spanish that well or at least only use it around family and friends of a similar hispano background.
Point being, that bright line being drawn by the media is not even remotely definable.
A good friend of mine when I was in the Air Force was a Mexican-American. He was from Brownsville, Tx. He got extra pay for being an interpreter. I asked him were there a lot of Mexican interpreters in the Air Force. He said no. I asked him why. He said most Mexicans that live all over the United States could not read or write the language. He said the Mexican language they spoke was a bastardized version of Spanish and most could not talk to a real Spaniard. Anyway he could speak it, read and write it, so he got extra pay for being an interpreter.
Mexico is a socialist-fascist country, which explains why we have so many mexicans trying to escape from their own country to the US. Unfortunately, the people escaping will import their brand of socialism because that is all they know. Five centuries of fascism is kind hard to shake off. And of course our esteemed politicians and business concerns are more than willing to grease the skids for the free sh!t army invading from the south, as long as they can be suitably exploited for profit and political influence.