I'm sorry if it was phrased badly. The point of the open letter was to explain that if a person was excited to have a black person as a President you had best make the first one elected top rate. Otherwise if he bombs when the next person of color runs people may say “I'm not voting for another Obama.” and we lose out on a great President who also happens to be black. I thought it was a good point anyways.
Now that I understand what you mean, I agree 100%. My wife and I were actually discussing that earlier.
I’ve even heard Obama supporters indicate as much, that Obama, if elected, will quite frankly be an awful President and ruin it for the next black guy.