We're an impressionable people.
All polls citing "hispanics" are suspect. If you're hispanic, then you know that race means something different to them than what the white anglophone and black anglophone gringos agonize over. It usually means culture more than anything. But every ten years, the Census Bureau spends millions of dollars trying to box all of us up. Generally, whitefolk and blackfolk play their silly game, but the Census Bureau understands that hispanics do not. They try to offer it in different terms every time, as well--compare the 1990, 2000, and 2010 forms--trying to get an accurate count. Currently, their best estimate is that something like 18 million US hispanics (out of around 50 million) checked the "other" box. They simply do not view themselves the way the pollsters would like them to view themselves. Don't try to pick apart the difference between 31% and 37% and 44% when it comes to "hispanic support for Republicans." It's a futile effort.
