Granted, picking apart Romney's speech to the NAACP is like shooting fish in a barrel, especially since he clearly was playing the audience in order to boost his bonafides with his audience, at least some of whom will appreciate him vowing to repeal "Obamacare". And FWIW, from the clips I've seen, Romney was received quite civilly, and even won applause for some of his criticism of Obama's performance as president.
The line that really caught my attention (full disclosure, I have neither read the transcript nor watched the speech, I'm just responding to the quotes and video clips I've seen) was
I believe that if you understood who I truly am in my heart, and if it were possible to fully communicate what I believe is in the real, enduring best interest of African American families, you would vote for me for president...I want you to know that if I did not believe that my policies and my leadership would help families of color – and families of any color – more than the policies and leadership of President Obama, I wouldn’t be running for president.