Democrats are torn individually (a state I share). On one side, they favor helping those in need, which inclines them to look sympathetically on immigrants; plus they’re relatively open to a multicultural, multiracial society. I know that when I look at today’s Mexicans and Central Americans, they seem to me fundamentally the same as my grandparents seeking a better life in America.On the other side, however, open immigration can’t coexist with a strong social safety net; if you’re going to assure health care and a decent income to everyone, you can’t make that offer global.
So Democrats have mixed feelings about immigration; in fact, it’s an agonizing issue.
Republicans, on the other hand, either love immigration or hate it. The business-friendly wing of the party likes inexpensive workers (and would really enjoy a huge guest-worker program that would both provide such workers and ensure that they can neither vote nor, in practice, unionize). But the cultural/nativist/tribal conservatives hate having these alien-looking, alien-sounding people on American soil.