Which president had to retake the oath of office?

Barack Obama had to retake it two times. In 2008 he took it but the Chief Justice messed up so the next day they did it again. Then in 2012 he did a private swearing as it was on a Sunday then the next day he did it in public.

Explanation:

answereruption of molten material; magnetic stripes in the rock of the ocean floor; the age of the rocks themselves;