I think he got exactly the reaction he wanted. Mitt Romney is going to talk about this event in the presidential debates if Obama talks about pandering to voters.
98% of black voters voted for Obama in 2008, so, for Mitt Romney, it'd be foolish to think he's gonna get any black votes. Mitt Romney is no fool, so there is obviously a different motive for Romney to go there.
My prediction is that he's going to talk to spanish speaker voters as well about his plans. He is going to talk to every minority about his plans. He's going to use the fact that he even was "brave" enough to be straightforward to these minority voters about his plans rather than pandering to them, like he believes Obama did.
The reason he was booed is because he used the term Obamacare instead of Affordable Care Act. It was the wording that screwed him, but, like I said before, he's gonna use the booing as fodder for his campaign. He's an idiot either way.
Also, I want to address the reason why he wants to repeal Obamacare. He believes that federal government should not be in charge of healthcare, but rather the states. He wants healthcare to be left to the states and not the federal government.