… and you can guess how that went.
According to that POLITICO post, the part that really got the crowd in a booing mood was when Mitt Romney talked about repealing the Affordable Care Act. You can give it to Romney on two things: showing up to talk to the NAACP at all and not backing down from his newly-minted conservative values, which he got after backing down from ideas like Romneycare and raising the minimum wage when it worried the Republican base too much.