Well, a lot of Hispanics are also European. Two people who lived in my dorm in college were Puerto Ricans with incredibly blonde hair and blue eyes and a lot of Hispanics think of themselves as "white". That's why race questionaires often go out of their way to get Hispanic people to identify as Hispanic and not white and also why they don't seem interested in recording mixed races.
The reality is that a lot of "white" people also have traces of American Indian and other races and ethnicities in them and if you family is from Southern Italy or Sicily, it's quite likely that there are some Arabs and even North Africans in your distant family tree. Sarah Palin's husband and children are mixed race, too.