African Americans cast in commercials as a token black, but look as clean and Caucasian as possible so that they are more palatable to white viewers. Unlike "colorism" the actor can be very dark skinned, but they will have thinner lips and nose, work an upper tier white collar job, and live in a new spotless home.
They won't be casting Leslie Jones for the reverse mortgage commercial...it's more of a Stacey Dash caucafrican kind of role.