You are the one injecting politics.
When Andrew Jackson kills a bunch of Native Americans, it's just "corrupt politicians" doing bad things. Never mind the D next to his name. Or the D next to Spitzers name or the D next to Al Gore's name or the D next to Edwards name or D's next to the people who turned up dead after WikiLeaks. If the economy started improving a couple years ago (i.e. more than the pathetic 2% growth its been maxing at), would you be saying, "Oh, yeah, it doesn't matter who gets the credit..." I highly doubt that. The media is careful to make sure everyone knows Nixon was a Republican but not Reagan (who was voted best president of the centure in 2000 btw).