President Obama sits in the back of his limousine after arriving at San Francisco International Airport outside San Francisco on Monday, Oct. 8, 2012. The president was spending the night in San Francisco campaigning and fundraising. (AP Photo/Eric Risberg)

Photo by: Eric Risberg

President Obama sits in the back of his limousine after arriving at San Francisco International Airport outside San Francisco on Monday, Oct. 8, 2012. The president was spending the night in San Francisco campaigning and fundraising. (AP Photo/Eric Risberg)