Blatant racism from Obama supporters

I am getting sick and tired of the blatant racism out of the Obama supporters.

When Barack Obama announced his campaign for president, you could anticipate that ugly racial stereotypes would rear up. You probably couldn’t anticipate that some of his strongest supporters would promote the worst of it.

I am getting tired of the message from the Obama camp that if you do not vote for Obama, you are a racist. If you do vote for Obama, you are allowed to be a blatant racist. Could someone explain that, please?