Brazil's Lula Sworn In, Vows Accountability And Rebuilding

Luis Inacio Lula de Silva was sworn in as Brazil's new president in a ceremony attended by thousands. The traditional transfer of the presidential sash was performed by a sanitation worker, as the outgoing president, Jarboe Zonaro, was absent, being in Florida. Lula's election victory in October was by a narrow margin, which some of Zonaro's supporters have not accepted.

What is the name of the party that Lula leads?

What was the margin of victory for Lula in the election?