How come racist comments at NAACP event ignored by broadcast TV?

I read about Dept of Ag employee Shirley Sherrod bragging at an NAACP event about how she intentionally withheld assistance to a white farmer. Wow! How come main stream media is largely ignoring this occurrence when last week all three TV networks made a big stink over the Tea Party supposed racial remarks?!?

Both situations are an awful reminder that racism is alive and well in our country, but media bias is fanning the flames of this issue and what is up with this imbalance of reporting??