Obama's polling weakness

Obama's Rasmussen Approval Index returns to -2, his previous low, without having risen above +2 in the interim.  Note that this rating comes less than a week after two public presidential events:  a press conference and the ABC-sponsored promotion (I think that's a fair way to describe it) of the Obama health plan.

Obama's overall rating, however, is 54%, one point over his previous low of 53% and still above the important 50% mark.  Nevertheless, could we be nearing the point where Obama can no longer count on staged public events to boost his ratings?
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