% Native born of US hispanic residents and voters

[rob in cal]

Anyone have a nice chart or site info on what percentage of US total hispanic residents are native born, and also of voters (i.e. how many hispanic voting citizens are native born).  I'm interested in this because my theory is that all the commotion about  bi-lingual ballots, political ads on univision etc etc is overblown, because the more likely someone is to vote the less likely they are to be in a Spanish speaking linguistic ghetto so to speak, and the more likely they are to speak English first, and Spanish second, or only barely.