until we actually go through a recession that started under Obama. Be patient, it might be occurring right now, though most economists are saying the likelihood of recession remains low. Here's an example of one prominent economist, St Louis Fed President Bullard:
http://blogs.wsj.com/economics/2010/05/25/feds-bullard-europe-woes-unlikely-to-trigger-another-recession/
Economists have been wrong in the past, so you can still hold out hope for economic decline.
How about waiting until Iran goes nuclear? I'd agree that if that occurs within the next year or two, then Obama can be blamed for it.
Now you can point to the weakness in Obamacare. That's a valid criticism though I think Supreme Court Justice Roberts deserve some credit for undermining the law.