Is this really surprising? He deserves props for even bothering to go.
We not going to progress in America so long as politicians feel "obliged" to go and lend their prestige to tribalist organizations. At least the progressivism of the Teddy Roosevelt variety was strong enough to say, "There's no such thing as a hyphenated American!"
I think you're missing the point. You're expecting Romney to run his campaign with the philosophy that race and racism don't exist. It's a lofty notion but it's not the world we live in.
I admire Romney for speaking to the NAACP. I'm sure it wasn't easy but its notable that he wants to expand the horizons of his campaign. So many conservatives and Republicans today claim to be colorblind people living in a colorblind society. It seems progressive but that attitude ends up ignoring the millions of minorities in this country who feel that their race or ethnicity has put them at a disadvantage.
Democrats have tapped into this emotion. Many in the GOP call it "divide and conquer" but it's one of the main reason why Dems do so much better with minorities.