“What leads you to this conclusion?”
Because that’s what happened. Were you there?
I watched it on television like most everyone else.
Chief Justice Robert administered the Oath of Office to BHO, but unfortunately flubbed a line.
So just to keep everything in order, the oath was administered again by Judge Roberts a day or so later at the White House in front of numerous witnesses. And he apparently got it right that time.
You may have noticed that BHO has been living in the White House since then.
So, if you want to claim that something else happened it would be keen if you could justify that.