In a blog post titled Smart Immigration Policy, Garth Zietsman does a detailed statistical analysis of the differences between the attitudes and opinions of high IQ people in the US and the rest of the US population towards immigration. Some excerpts from his blog post are below:

Overall it seems more intelligent opinion thinks immigrants are good for America and that they contribute to improving America and making it more open. More intelligent opinion denies that immigrants make things bad. The Smart Vote is against immigrants increasing crime, taking away local jobs or undermining national unity. Finally more intelligent opinion is that there a small but non-zero chance that immigrants lead to economic growth. In short, the more intelligent the person the more likely they are to think that immigrants are not bad but good for America. The general public however tends to think unintelligently on immigration taking jobs away and undermining national unity.

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In spite of intelligent opinion regarding immigrants as a good thing generally this doesn’t translate into advocating letting in more of them. More intelligent opinion seems to think current immigration rates are close to ideal. Overall, more intelligent opinion is for assisting legal immigrants to overcome problems and bias, and perhaps granting them equal rights, but for keeping the rate of immigration close to the current rate. The majority of the general public, however, seem to lean toward the less intelligent choice of being unhelpful to immigrants and toward greater exclusion of them – both legal and illegal.

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To summarize – the smartest view on immigrants is that they are good and not bad for America, and that the current rate of legal immigration is about right. Whether to help them or give them greater rights is unanswered. The general public’s view however is that immigrants do have a few bad effects and leans towards reducing the rate of immigration generally.