Washington ? Justice Sonia Sotomayor has taken her seat at the Supreme Court in front of a packed courtroom that included President Barack Obama and Vice President Joe Biden.

The ceremony Tuesday was just for show. Sotomayor and the rest of the court will return today for the argument in a key case about campaign finance law.

Sotomayor, 55, last month became the first Hispanic and third woman to be a justice. She took the oath again Tuesday in a ceremony by which the court formally welcomes its newest member.