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I have found an error in the article: the Democratic nominee is selected in August, thus it is incorrect to state that Obama won the nomination. In the past, other candidates have won enough pledged delegates to be certain of being the nominee, but this election year neither Clinton nor Obama have enough pledged delegates to win the nomination, thus they must wait another two months for the superdelegates to vote for them.
Superdelegates can switch their preference whenever they want. Note that Clinton has gotten increasingly stronger during the past months while Obama has suffered major setbacks. Gary Hart had to drop out due to a problem that I assume most people find less bad than many of the problems that have been revealed about Obama. Thus, it is possible that Clinton will be the nominee.