I agree that Obama was the President starting noon, but not yet the Acting President. From the time Biden sworn in until Obama retook 2nd oath, Joe Biden was the Acting President, according to what I've researched. During this time, I am unsure of what executive orders Obama had signed. It could be invalid and that Biden was the Acting President at the time. Someone could challenge that in court.

It seems that Obama had broken another tradition by not taking the customary oath before the public oath service. This shows when Obama retook the oath the next day.

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