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Hillary Clinton always promoted a more progressive health care program. From his initial foray into national politics, it was quite easy to see that Obama's only real appeal to progressives was that he was a minority and that he was not Hillary.
His actions even in the campaign were quite clearly Rovian in nature, so no radical change could be assumed from the way he campaigned. His vote on FISA made is even clearer.
By the time the GE came along, he really had to live down a few statements regarding the handling of foreign leaders, etc. By then, it was pretty clear that he was a cautious centrist. Only the fringe elements thought otherwise.
I'm not sure how much the progressives helped him. On the internet, it looked big. In reality? I haven't seen a good analysis yet on the actual impact.
But I do know that nobody is too worried if they are bothered.