San Francisco mayor Edwin Lee, center, and Baltimore mayor Stephanie Rawlings-Blake, third form left, survey a vacant lot before joining volunteers in a revitalization effort in Baltimore, Friday, April 26, 2013. Lee visited his counterpart in Baltimore to make good on a Super Bowl XLVII bet to take part in a day of service in the winning mayor's city. The Ravens beat the 49ers 34-31. (AP Photo/Patrick Semansky)
