the last time san francisco had an interim mayor was 30 years ago, when, in 1978, george mosconi, was assassinated by supervisor dan white. >> both to grow rather mosconi and harvey milk have been shot and killed. >> they needed a new mayor at the time. the board got together and appointed dianne feinstein. >> we did not have much to go on and looked at 1978. there were no hints as to who put it on the board, if any discussion occurred about a process. >> what triggered san francisco's search over 30 years later was gavin newsom's election to the office of lieutenant governor. >> i put myself up as a candidate for the tenant governor, won, thanks to the overwhelming support of the city. >> that is when we try to look for someone to take over his final year of the mayoral term. >> it is clear we have to do something in san francisco. we have to pick a mayor. that job was not up to the voters but the board of supervisors. by a majority vote, supervisors are able to choose the interim mayor. that is when the fun began in city hall. who would he be? >> we needed to protect -- perfect the