I was one of the people who thought that anti-Harold Ford TV ad was meant to stir up racial feelings, but I think the complaints about this new radio ad are ridiculous. There's a complete mismatch between the criticism and the actual drums in the ad.
It's terrible to use racism in politics, but who's doing it more? Are Corker supporters trying to make people feel a racist antagonism toward Ford, or are Ford supporters trying to make people think Corker is a racist? Both things are wrong, and both sides should be careful to avoid even the appearance that they are doing anything like this. But at some point claiming you've perceived racism makes you look dishonest or paranoid... mostly dishonest.