He more resembles Stalin. And Stalin (A) was the model for Saddam Hussein and (B) killed more people than Hitler.
I think he resembles more Hitler because like Obama he kept superficially the structure of private ownership and enterprise, while undermining them by redtaping and making them beholden to government.
Also unlike Stalin or Saddam, Hitler and Obama achieved power not through revolution or a coup, but through a democratic process.
Stalin merely was an heir to Lenin, the Sovietunion was already a tyranny.
Hitler turned step-by-step a democratic republic into a one-party dictatorship. Obama is following in his footprints.
Also the US, like Germany then was a modern, western country, unlike the underdeveloped Soviet Russia and Iraq.