UPDATE 1-In New Orleans, Obama fires back at critics

* Obama : Change is hard, big change harder * "I'm a pretty tough guy," Obama says * Town hall shows evidence of partisan divide (Adds Obama quotes at San Francisco fundraiser) NEW ORLEANS , Oct 15 (Reuters) - U.S. President Barack Obamafired back on Thursday at critics who say he has fewaccomplishments of note in his nine months in office anddeclared he was just getting started. In recent weeks, Obama has faced criticism both fromliberals who want him to do more to advance causes such a

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