Why are some in the Liberal Media claiming the the Marathon Bombings were done by Right Wing Extremists or the Tea Party?

MANY COMMENTATORS ARE ALREADY ADVANCING THE IDEA THAT THE BOSTON BOMBINGS WERE DONE BY RIGHT WING EXTREMISTS.  FOLLOWING THE JFK ASSASSINATION THE MEDIA WAS QUICK TO POINT THE FINGER AT THOSE ON THE RIGHT. 

BUT WHEN IT TURNED OUT THAT THE KILLER WAS A FULL BLOWN LEFT WING COMMUNIST, THOSE IN THE MEDIA SUDDENLY BECAME SILENT AND LITTLE WAS SAID ABOUT LEE HARVEY OSWALD.  POLITICS---SUDDENLY IT SEEMED TO BE UNIMPORTANT THAT HE WAS A FAR LEFT RADICAL.

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