You're theory about "camellion" is probably pretty close. I live in the 2nd most conservative city in the nation (2nd only to Provo, Utah), and I personally don't know any hispanics who are democrats. There are 3 or 4 semi-public figures who are "brown-power" type rabble-rousers, but I'm not acquainted with them, and I have a feeling they would be liberal even if they weren't hispanic.
And there you have it.