Their excuse for that is “He was busy cleaning up Bush’s mess.” (They really believe this.) I do sometimes smile gently and say “Well, he’s definitely done for America what he did for Chicago.” Then I refuse to elucidate further. That always makes them scowl.
One acronym will kill their Obama buzz when uttered: ACORN
After explaining Obama’s role in ACORN during his community organizing days and votes as Senator, I don't suffer fools as that propaganda gets thoroughly diffused. They return to their corner talking about the newest ‘People’ or ‘Us’ magazine tripe.