I understand your point, Charles, but it is still surprisingly poor style to use “I” and “me” that much unless the topic is explicitly autobiographical. I have to wonder about the speech writers (assuming the Obamas did not write these themselves). If there had been a chance of winning, it would have been better to use “YOU” and “THEY” to show what Chicago could *give*. Fine points of style may indeed not mean much, but this is equivalent to writing a letter in which every paragraph starts with “I.” It just rubs people the wrong way.