Romney would be ok if he had said 28.6%
The problem with "47%" is that it is clear that it includes white people. Otherwise the comment would be perfectly fine. Us libs might object, but the media would yawn and the GOP, rather than distance themselves, would embrace the comment with gusto.
This is one area where people like Newt and Rick Santorum are more savvy than Mitt, they know all about what I'm talking about.