You'd be surprised at how much influence sports reporters can have on people, and not all of them are on ESPN. Howard Cosell and Bob Costas have both influenced sports fans everywhere. Yes, the whole Ginny/Harry relationship is poorly written in the books, but the great thing (for JKR anyway) about these interviews is she can throw crap out there and not have to explain it in any depth. On the whole the interview is pretty bad. In every other online chat/interview I've seen there are a few...
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