While interesting, these polls are largely worthless...
True.
A lot of the changes in the postive and negatives generated by these polls come from the shifting views of him by his leftist adherents.
There is a rock hard core of anti-Obama moderates and conservatives which generates the 13-16% overage of people who STRONGLY disapprove of this loon. There is a rock solid core of individuals who will ALWAYS support him - about 28% composed mainly of ethnic backers.
And, what accounts fo rmost of the fluctuations, a changeable group of far-left radicals which shift from opposing to backing him, depending on how insanely leftist he is perceived by them at the moment.