Or he's reading a speech written by a professional. We'll never know which.
I like Obama the man, I'm far less impressed with Obama the president.
Presidents have speechwriters, get over it. The speechwriters don't hand something to the President for him to read that's got nothing to do with the President. They write things that are reflecting his views and way of speaking. Many of JFK's best speeches were written by the outstanding Ted Sorensen, but if you read JFK's own writing and his edits to the speeches, they are also great and similar, Sorensen was writing like JFK.
Similarly, Presidents with some of the worst speeches had speechwriters, who also reflected the President.
George W. Bush didn't come up with the phrase 'Axis of Evil', two of his speechwriters did, but they did so reflecting him. Presidents get the blame or credit for the speeches.
Even a President like Reagan was greatly aided by his speechwriters, but deserves credit that their phrases had qualities of his. Presidents review and edit their speeches, as well.