racial polarization of america

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of late i have noted that a lot of the stories on the news in mainstream media in America has been racially charged. recently the forced resignation of Cheryl sherrod has gotten alot of air time. some would say too much airtime. this together with the constant battles between the so called tea party movement vs the NAACP is making the country seem like we are in the midst of a civil war. and the media is rily not helping the situation. why was this not the case when there was a white president in office?