The Obama Inauguration: Data

On January 20th, President Barack Obama of the United States was sworn into office. The US Constitution is unclear on precisely when a President’s term of office starts – one section states that the President-elect becomes President as of 12 noon on the day of inauguration, even if he doesn’t take the oath of office; while another section states that he must take the Oath of Office with the specific language of that oath.
In the event, President Obama took the oath at 12.06 EST, but muddled the words a little (typical retrograde Mercury moment!). So, to make totally certain, he retook the oath the next day in the White House at 7:35p.m. EST.
We therefore have three possible charts for the beginning of his term of office. It will be interesting to see which one turns out to be most accurate.