I received some expert opinions on my inquiry into this bird and after more research I am leaning towards Cassin's which I thought it might be, but was unsure because of its bright color. I'm now leaning that the fall/winter molt takes place on the breeding ground and makes these birds look quite bright in the Fall. There were a few who thought it might be a Vagrant Blue-headed Vireo, but I don't think so at this point.
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