President Obama, right, is greeted by California Lt. Gov. Gavin Newsom, third from right, and San Francisco Mayor Ed Lee as he arrives at San Francisco International Airport Thursday, Feb. 17, 2011. (AP Photo/Carolyn Kaster)

Photo by: Carolyn Kaster

President Obama, right, is greeted by California Lt. Gov. Gavin Newsom, third from right, and San Francisco Mayor Ed Lee as he arrives at San Francisco International Airport Thursday, Feb. 17, 2011. (AP Photo/Carolyn Kaster)