Mr Unger's comments seem to  be politically  to the left of Mr Obama, but he insists that the  Republicans would be no more  destructive than the Democrats as 'the risk of military adventurism' would  remain the same.

And some would doubtless strike a  chord with  the President's GOP opponents, including the academic's  attacks on Mr Obama's  efforts to reform healthcare.

Mr Unger argues: 'He has subordinated the  broadening of economic and educational opportunity to the important but  secondary issue of access to health care in the mistaken belief  that he would  be spared a fight.'

He also suggests that, despite their  fierce  rivalry, the Democrats' agenda is little different to that of the Republicans,  saying the party aims 'to put a human face on the  programme of its  adversaries'.

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