Two days ago we asked if Barack Obama's acceptance speech had legs, as we expressed skepticism that the speech was nearly as good as the critical reaction. The immediate answer to our question is, apparently not. The tracking polls moved during the convention a bit, but not after "the speech." It may be that the reaction to the Sarah Palin choice took the wind out of the Democrats' momentum.
But the likelier explanation is that while Obama's super-partisan speech appealed to Democrats at home and in the audience, it didn't fare nearly as well among independents and Republicans, despite the record viewing numbers (38 miliion).