It seems that the speech only gave a small, temporary bump to his poll numbers that has since evaporated.
Forty-five percent (45%) of all voters nationwide now favor the plan while 52% are opposed. A week ago, 44% supported the proposal and 53% were opposed. (see day-by-day numbers).
I think if he came out strongly in opposition to a public option he would breeze just about any other change through and his poll numbers would quickly improve. I think most insured people see only pitfalls in a public plan and don't trust the government enough to run the thing correctly.