Was Glenn Beck wrong for calling Obama a racist?

Do you believe Glenn Beck was wrong for his comments against Pres. Obama? Should he have apologized? My personal opinion is Barack Obama is not racist and the apology was warrented. I'm not a fan of Obama, but I don't think slandering our commander and chief over something that has no real evidence is what this country needs with the manybproblems we already have. Glenn Beck does have the right to speak his mind and opinion as an American and also has the right to admitt when he's wrong. He's only human. So what do you think. Mature answers please.