Suppose Obama used the Democratic supermalajority in Congress early in his term to pass truly liberal reforms, such as expanding Medicare to cover full single-payerror healthcare rather than the halfway measure known as Obamacare, expanding labor laws and tightening their enforcement to give them real teeth, bringing back Glass-Steagall, ending the war on drugs, ending federal use of private prisons, etc.
Suppose he had pushed through stuff like that. Would he get reelected? He'd no doubt get attacked savagely for it, but what would be the overall political repercussions?