My point is made.I did re-read my statement and your response. I even thought about it. No, the irony is still there. He did not want to waste time with birther silliness, yet he wasted time with that silliness on Oprah.
But I think I understand your point. Really I do. You are saying that those who constantly disagree with someone will have the validity of their argument weakened because of repeated disagreement.
Well, then, along those same lines, (and back to the OP) continually calling someone or a group of people "racist" based on anything and everything he/she/they do kinda makes the word meaningless. Disagree with the president, you're a racist. Ask questions about him, you're a racist. Attend a rally against the president, you're a racist. Bring a rifle to an Obama rally (a stupid thing to do), you are a racist (even though the one who did it was black) Does anyone really believe if Bill Clinton had the same background as Obama, with the same questions about his citizenship, that he would have skated through the Republican scrutiny on this issue? If so, you probably don't understand the failures of our current two party system.