I thought for a second I was the fool 
I'm only "a" fool at worst!
But I find the question interesting. I mean, I live in an overwhelmingly Puerto Rican neighborhood here in New York, and I don't think most of the people I see outside of my apartment would consider themselves either white or black Hispanics. I would imagine many people think in terms of a Asian-White-Black-Hispanic paradigm, possibly with South Asian and Arabic thrown in, long before people start conceptualizing themselves in terms of white and black hispanics.
I mean, I guess the fundamental question is what you're trying to measure in the census.
Cubans and Puerto Ricans readily self-ID as White or Black Hispanic.
