Slate highlights this photo from White House photographer Pete Souza:

The photo shows only a portion of the first page of what was a rather lengthy speech, but what we can see nonetheless largely confirms previous anecdotes that Obama prefers to take an active role in shaping his remarks, particularly for major events like an inauguration or State of the Union address…The changes you can make out if you zoom in on this particular photo range from minor grammar tweaks to some relatively heavy rewrites.