NPR had a great analysis of Obama's public oration style and just how overrated it is by liberals because it reaffirms their biases:
Also it's pretty funny that you mentioned that Obama speech before the NFL kickoff, because not only was it politicizing 9/11 and attacking Trump, it even got booed by Ravens fans.
Not really, he simply repeats the same message of identity politics, no matter what the occasion. He drastically overuses the "dramatic pause" method that is meant to give gravitas by inserting silence. His message of identity politics that centers on increasing diversity and commonly shoe-ing in race issues gives him the same air of academic liberalism that young liberals associate with intellectualism. He sounds like a humanities professor at Yale when he talks.