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For Bush, there was one other hopeful sign last week. Four years ago, on June 16, 1988, Bush was reported to be 15 points behind the Democratic front runner, Michael Dukakis, in a national poll and was widely believed to have all but lost it. Later he slipped even further behind before finally pulling ahead. Bush has almost five months left in the 1992 contest, and as Bill Clinton said recently, five months is an eternity in a presidential campaign.