Why Obama will be tough to beat
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0 Left 0 Centered 0 RightEditor's note: Julian E. Zelizer is a professor of history and public affairs at Princeton University. He is the author of "Jimmy Carter," published by Times Books, and editor of a book assessing former President George W. Bush's administration, published by Princeton University Press. Princeton, New Jersey (CNN) -- Republicans are looking ahead -- some with glee and others with fear -- to the presidential election in 2012.Many in the GOP, ranging from former Speaker of the House Newt Gingrich t...