What are you talking about? "Hispanic" voter turnout is among the lowest of the low, and the ones who do vote do so for the socialists.
As for family owned businesses, yes many are restaurants. However, many do receive loans. That does not mean that all do. Furthermore, many of these extended families do live together in one house until they have saved enough money to open up another restaurant. I will not deny that most restaurant owners seem to assimilate better than the ones you see in construction, heavy labor, in restaurant kitchens, etc.
You've gotta compare first generation with the others. People fresh off the boat (or whatever the inappropriate metaphor is) vote religiously. Something about being born here screws people up and makes them take voting for granted. 90% of black voters in this country voted for Al Gore and you're worried about the Mexicans turning us socialist. Priorities.
I think the restaraunt owners assimilate faster because they have to speak English to do business. If you're in construction or other heavy labor in any city with a fair sized Mexican population all your co-workers are mexican, no reason to speak English. It's kind of a self fulfilling prophecy, if you're trying to find work in America and you don't speak English you're stuck in heavy labor with a bunch of other people that don't speak English so you don't get a chance to learn the language. If you already speak English you work in areas where you get to learn the language. That's why the second generation is usually the assimilation generation, they get exposed to English in school and on TV in those important language years (2 through 7) and learn it.