Ezra Klein wonders how Obama will respond if Republicans take back the House and Senate:
If they just take back the House, Obama can't anger Senate Democrats by shifting his agenda too dramatically. That's a world of gridlock. But if Republicans manage to grab both houses of Congress -- unlikely, I know -- Obama will face the same choice that Bush and Clinton did: Does he transform his agenda into something he can work with Republicans to achieve, as Clinton did? Tax reform could fit here, or if you want to worry liberals, Social Security reform. Or does Obama use the veto pen as a scythe, and try to arrange the politics for a big comeback in 2012?