WASHINGTON, D.C. - Vice President Joe Biden has taken a ceremonial oath office, kicking off the start of his second term as Number 2 to President Obama.

Biden, placing his hand on a family Bible that's been in use since 1893, took a public oath from Supreme Court Justice Sonia Sotomayor.

Biden was formally sworn in during a private ceremony on Sunday at his residence, the U.S. Naval Observatory.

The Constitution requires presidential and vice-presidential terms begin on Jan. 20. Sotomayor also administered the private oath.