keywords: paulo silva sao mayoralty brazil
text: Brazil's Ruling Party Faces Sao Paulo Run-Off Vote  SAO PAULO, Brazil (Reuters) - President Luiz Inacio Lula da  Silva's Workers' Party (PT) won the mayoralty of six state  capitals in Sunday's municipal vote but was forced into a  run-off to defend its hold on the race's biggest prize, the  city of Sao Paulo.