Absolutely DID NOT. If you listen closely, there are TWO flubs. Precious O stepped on the opening line of Roberts, "I Barack Hussein Obama do..." right there Obama jumps in and starts before Roberts can finish the first line.
You're not going to kill my thrill ... The Eloquent One blew his lines. His first lines.
He should have rehearsed, gotten a teleprompter, or gotten Katie to feed him lines.
John Roberts however, put the first two together and didn't pause after the name.
Watch it for yourself: http://www.youtube.com/watch?v=A2B8-RME13I
I'm not sure if there is any precedent over the rhythm of the oath taking.