They're conservatives. They care about hierarchy. They're the "good Latinos", and dislike others who didn't just get into the country automatically when they stepped onto dry land.
Honestly Mexicans are more conservative and it's pretty dumb of the Republicans to cater to random white racists. I bet as Mexicans in the US gain wealth the Republicans will just pretend to have loved them all along. "Those were other Republicans, not real ones like us."
Its only a matter of time until theyre considered "white".
For those of you who are unfamilair with the term "whiteness", you should look at how the irish and italians werent considered "white" until it was convenient.