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http://letters.salon.com/opinion/feature/2008/04/07/hillary/permalink/42ef100aa4cf15afe7647a2a2818a5c2.html
Exactly right.
"If the rules had been different, Hillary would have won" does not take into account the different strategy that the Obama camp would have adopted if the rules had been different.
It's very poor reasoning on Sean Wilentz' part -- it's actually more mindless regurgitating of the Clinton camp's talking points. Rather shameful for someone who's supposed to be a top academic.