Why do people here on Y! that people want obama to be impeached. what are the charges for his impeachment?

He has broken federal law by undermining congress and the justice department on Libya. A president has 90 days to use our military in conflict without congressional approval. Obama has surpassed his 90 days on Libya yet claims he does not need congressional approval because it is not 'hostilities'. Well, if it's not hostilities, why do they need our bombs and planes? We are using the peoples tax dollars to pay for this and our military to carry it out and this guy thinks he does not need approval after his time limit is up? His ego is mind boggling. He has violated the War Powers Act by not immediately ceasing war efforts in Libya after 90 days.