When people quote sources like DailyKos and MoveOn, people are free to point out in what ways the material in those sources is wrong, as I did with the New York Post. If they just say (as many do), "that's not a credible source", but they don't provide any counter arguments, they have not made a successful argument against that source. I didn't do that. I said they're not credible, and then I debunked their arguments. I made a successful argument against that source.