Obama refuses to abide by the War Powers Act. Should he be impeached for it?

The War Powers Act of 1973 says that the president can use military force without congressional approval for up to 60 days in an emergency. But must go to congress after 60 days to get authorization to continue using military force. The not-a-war in Libya has been going for 60 days. Obama says he won't ask for congressional approval and will continue the war without it. This is a clear violation of law and an over reach of his constitutional authority. Should he be impeached for it? Can an impeachment be successful? What can be done to hold him accountable to the law?