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Whatever the future, the young, by their sheer numbers and in the galvanic example of the McGovern campaign, have profoundly altered the chemistry of American politics. Committed, surprisingly professional and potentially volatile, they are a huge, insistent presence in the Democratic Party, as irritating in the political family as a suddenly matured prodigy who has aggressive manners and uncomfortable ideas. To beat Nixon, the Democratic nominee must somehow bring the family intact through the battle of Miami Beach or, if that proves impossible, put it back together again before the real war is joined on Labor Day.