Josh Barro thinks it's the Republicans, here:
Democrats cannot force Republicans’ hand unless they are more willing than Republicans to let all the Bush tax cuts expire. And they won’t be. A full expiration might well cause a new recession, which would be even more politically damaging for the Barack Obama administration than for congressional Republicans. Congress is already about as unpopular as it can become, and Republicans know they are not going to get their legislative agenda enacted in the next two years anyway. But a new recession would greatly interfere with Obama’s second-term plans.
