Bryan Caplan articulates the conventional wisdom: the GOP doesn't win South Asian voters because it doesn't bow down enough to South Asians. For example, Republican leaders should put the kibosh on anybody associated with the Republican Party who doesn't feel fully respectful toward "arranged marriages."
I suggest the opposite is more true. As Ben Franklin pointed out, the way to get people to like you more is not to do them favors (which just makes them resent your ability to do them favors), but to get them to do you favors. Bryan, however, assumes that self-assertion in politics to be a risky strategy, and that it's better for political parties to try to get what they want by being nice.