I'm not sure how I missed this, but immigration restrictionist Mark Krikorian apparently thinks Puerto Ricans aren't Americans:
I'm at a hearing of the immigration subcommittee, and the pseudo-congressman from Puerto Rico is going on about how “we” are a nation of immigrants. “We”? Puerto Rico is a foreign country that became a colony of the United States in 1898, no different from the French colony of Togo or the British colony of Uganda (or the U.S. colony of the Philippines). Congress granted residents of the island U.S. citizenship during World War I, but Puerto Ricans remain a distinct people, a distinct nation, with their own (foreign) language, their own history, their own culture.
I was surprised to learn that Krikorian, who was enraged by the idea of people correctly pronouncing the name of Sonia Sotomayor, the first Supreme Court justice of Puerto Rican origin on the Supreme Court, was such an ardent Puerto Rican nationalist. I'm sure that like his views on immigration, it has nothing to do with his concern that Latinos tend not to vote "like other Americans."