WASHINGTON, D.C. - The nation's No. 2 was sworn in a second time, for a second term.
Like President Barack Obama, Vice President Joe Biden took his oath of office during a private ceremony on Sunday. This one was for the masses.
Biden, a former Delaware senator, has attended a bunch of inaugural festivities.
The next one he attends may be his own if he decides to run for president in 2016 -- and wins. He's certainly keeping the door open to a future presidential run.