Colin Powell Endorsement strictly RACE based?

This weekend Colin Powell finally came out and endorsed Obama. MANY believe it was done because he is BLACK and that's it. n my opinion Powell would have been a great leader. It is a shame he was thrown to the side of the road by the Bush camp. Still, the timing of his endorsement is to say the least is chicken shit imo. He waited until Obama was up big in the polls before making his endorsement? Way to stick your neck out Powell!