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Some reasons are obvious. A re-election bid is hardly as exciting as the historic anointment of the first black nominee, on his way to becoming the first black president. And Barack Obama is no longer a rising star: He’s, well, an incumbent.

Also different is the general tone of this year’s campaign — not so full of lofty thoughts about hope and change, but focused on evoking doubts about Mitt Romney. Romney is trying to do the same with Obama. “This is a campaign based on raising questions about the other candidate,” says Democratic consultant Chris Lehane. “It’s a whole different narrative this time.”

There’s also the possibility that some Hollywood celebrities have lost a measure of their enthusiasm for the candidate they warmly embraced four years ago. The most public of these has been actor Matt Damon, who as recently as last month repeated his disappointment with the president — while adding that he was still the “clear choice.”

Read more: http://nation.foxnews.com/celebrities/2012/08/25/stars-skipping-democratic-national-convention?intcmp=fly#ixzz24ax3PfE5