The poor don't support Sanders, Clinton wins the poor because of her support with Minorities.
Poor whites? Maybe. It'd be interesting to see if Sanders or Trump got more votes from poor white people.
Well, to take Wisconsin as an example (since it's one of the whiter states to vote since the GOP field shrunk), if my algebra's right, the exit poll says that 37% of Sanders supporters make under $50k a year, while for Trump it's 33%. (Though of course, even in Wisconsin, some of those Sanders supporters are non-white, moreso than the Trump supporters, so the gap would probably narrow a little if you only looked at poor whites.)
However, Trump has won more votes total than Sanders has nationwide, so it's possible that Trump is slightly ahead of Sanders with poor whites nationally. It's probably pretty close though.
