President Obama’s re-election team has been training its fire on potential Republican opponents of late. But the question of what the president is for, rather than what he is against, has been met with diffuse answers. Those answers tend to revolve around either general sentiments about protecting the middle class or a broad miscellany of policy goals — economic regeneration, environmental protection and educational improvement among them. The problem for Team Obama is that, so far, they have found no clear way of encapsulating his case for a second term. The option of running as the candidate of “hope and change” is no longer available for a man who has occupied the Oval Office for almost three years. But the search for a concise rationale for his candidacy — the ‘bumper sticker’ of the 2012 campaign — has not yet been fruitful.