YES We did!

[Moonliner]

Originally Posted by Ghoulish Delight

The oath of office is pure formality. According to the constitution, he was President the moment it hit 12PM eastern, oath or no oath.

Technically yes, but according to some constitutional law eggheads I work with the power to sign legislation (ie closing Guantanamo bay) is dependent on a successful completion of the oath. So there is a suggestion that the oath be readministered in private ASAP to forestall any future challenges.