Thomas Sowel, the Doctor of Economics, has hit the nail on the head again (as usual).
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In words, Obama is a uniter instead of a divider. In deeds, he has spent years promoting polarization. That is what a "community organizer" does, creating a sense of grievance, envy and resentment, in order to mobilize political action to get more of the taxpayers' money
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It's NOT negative campaigning to bring up a candidates past positions and political beliefs.
http://www.realclearpolitics.com/articles/2008/10/negative_advertising.html