Q. Why do presidents have to wait all the way until Jan. 20 to assume office?

It used to be a lot longer. Until 1937, presidents didn't get sworn in until March 4 because it took so long to count and report ballots, and because of the winner's logistical issues in moving to the capital.

But then better technology kicked in, and the 20th Amendment moved presidential inaugurations to noon on Jan. 20 -- allowing presidents to start taking care of business sooner.