Politics is downstream of culture, and as the demographics of the country shift more towards those of Mexico or Argentina (for instance) we should not be surprised when our political climate reflects that.
But it seems to me the opposite is instead true. Are you perhaps suggesting the non-immigrant, white males supporting the current political climate look up to the immigrants as role models?
Immigration is not the reason the U.S. is not losing the Lockean "rule of law and property rights" layer.
It's losing it because other ideas have come to predominate the intellectual landscape.