US President Barack Obama won't need to work hard to disgrace Mitt Romney, the man hoping to win his job, thanks to a brutal Republican primaries campaign.
Romney's own rivals for the Republican nomination may have bloodied him enough, says political science professor Ken Mayer, and Obama's team need only recycle material from the past few months in order to discredit him.
But Obama will have to be careful not to 'push too hard' on Romney's business record, because although he has committed misdemeanours, he does have more experience in economic management, says Professor Mayer.

