I'd like to draw your attention to this New York Observer article published today
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Will it be September?

Certainly, the recent buzz about a possible Gore campaign in 2008 doesn’t seem to be spontaneously generated. According to one influential Democratic insider, close associates of the former Vice President have communicated to him and other prominent fund-raisers who are uncommitted to the other ’08 candidates that Mr. Gore will consider entering the race—if an opening presents itself—in September.