It doesn’t sound like “O God” at all - not enough syllables, for one thing. Listen to it again; you can clearly hear “Deliver us Obama,” with a couple of voices standing out loud and clear.
This is not surprising at all; it was in the context of a political rally about Bambi’s “healthcare” plan, and these people are simply nutz. I doubt that this is the only time this has happened.
I clearly hear it too... And, maybe I’m blind (I’ll have to go watch this AGAIN now - YUCK!), but I don’t remember any captions for the responses! (Of course I went to YT to view the video, but it shouldn’t be different than watching it at Breitbart).
It’s the Syllables that are the tell here. Plus at 2:36 you can clearly hear them say “Hear Us, Obama”. You can also tell it is “Obama” because there are no hard consonants heard — no “Guh” or “Duh”, and you should definitely be able to at LEAST hear the “DUH” sound at the end of the word if that is what they were saying.