George Zimmerman the guy accused by the media, activists--but not the police or prosecutors--who shot and killed Trayvon Martin is being described in much of the media as a "white Hispanic." In the decades that I've labored as a newsman and columnist, I've never see a suspect in a crime described as a "white Hispanic." In stories about immigration and other social issues, the term also rarely, if ever appears.
The census bureau and demographers often use the term, as opposed to black Hispanic. Political correctness explains why--it's complicated--but now the term appears to beginning to make it into the mainstream. Jonah Goldberg at the National Review has an interesting explanation:
White Hispanic.” That’s how the New York Times, Reuters, and other media outlets have opted to describe George Zimmerman, a man who would simply be Hispanic if he hadn’t shot and killed 17-year-old Trayvon Martin. The term, rarely if ever used before this tragedy, is necessary in telling the Martin story in a more comfortable way.
I think that it's a good explanation.