WASHINGTON (AP) — Four years ago, President Barack Obama and his staff spent the first day in the White House learning the basics. Not just the basics of governing, but also figuring out how to get cleared into their offices by the Secret Service, log on to their government computers and find keys to unlock office drawers.

They solved those problems long ago. Also in the rearview mirror are the economic recession, the Iraq war and the hunt for terror mastermind Osama bin Laden.

But plenty of fresh challenges lie ahead as the president and his team begin the first working day of the second term Tuesday.