I'm only going by what one political commentator has said.

You can find political commentators who say just about anything. We pick out the ones to credit either on the basis that they have a particularly good record of getting it right, or that they have said something we agree with.
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The evidence appears to be that Obama is a pretty good writer, quite capable of writing a good speech. What politicians generally do in campaigns is to have writers who draft speeches based on their general style of speaking and their known policy positions, with the expectation being that these will be used as the basis for the speech, adjusted and interpreted by the person delivering it.

In the case of this speech it would seem more likely that Obama would in fact have written it himself, probably running it over with colleagues before delivering it.

This is a bit of a circus, but that doesn't mean the acrobats aren't doing it for real.