Why is the media spending so much time and money searching sarah palin emails?

but they spend no time searching anything on obama ever . not when he was running for office . not now . and they wont Research anything on obama when he runs again in 012. so the MSM . will go to hell and back to read emails of sarah palin who is not ruining for president. but they wont left a finger to do any Research on obama . the parson who is ruining our country . why. can anybody explain to me why the MSM are being such hypocrites.