Interchangeable. However, Republicans and "conservatives" would be more likely to oppose warmongering and stupid/evil policies under Obama. And the public would be much more likely to blame liberalism or socialism for the country being in the toilet.. I don't think OWS' nonsense (or worse) would have as much of a chance of gaining a serious foothold in public opinion under him. So I guess Obama, if you held a gun to my head. Of course there's a small part of me that would be happy seeing him lose in an landslide to just about anyone.
Beyond Ron Paul, where is the Republican opposition to any kind of warmongering?