Sup. Aaron Peskin joins crowded race for San Francisco Mayor

The race for San Francisco Mayor is heating up in advance of the November election, as City Supervisor and Board President Aaron Peskin tells KTVU he will officially announce his campaign for the job over the weekend. KTVU's Heather Holmes and Frank Mallicoat are joined live in studio by Corey Cook, provost and executive vice president at Saint Mary's College, to discuss how his candidacy could change the race.