If Only Nixon Could Go to China, Only Obama . . .

It has often been the case that significant political changes can only occur when a President plays against type. So only Nixon could go to China and only George Bush (41) could sign the 1990 Clean Air Act (the largest and most costly environmental statute ever enacted. Perhaps, by the same token, only a Democratic president could legitimize (and in some cases expand) the aggressive anti-terror policies of the Bush (43) Administration, as Obama has done. Are there plausible opportunities for President Obama to play against type in his second term? Entitlement reform? Trade? Something else? If so, what are they? And why are they plausible? Discuss.