I know this is a Right-Wing site but it has lots of links to reports that make it more than verifiable. This does not surprise me as I am familiar with the Hispanic community here in Las Vegas and this appears to be the trend.
62 MILLION PEOPLE IN US NOW SPEAK LANGUAGE OTHER THAN ENGLISH AT HOME @ Report 62 Million People in US Now Speak Language Other Than English at Home
And then there is this → U.S. CONGRESSIONAL DEBATE IN CALIFORNIA HOSTED ENTIRELY IN SPANISH @ U.S. Congressional Debate In California Hosted Entirely In Spanish