2010: President Obama visits Chicago

President Barack Obama points towards visitors singing "Happy Birthday" to him as he walks towards Marine One helicopter on the South Lawn of the White House in Washington, Wednesday, Aug. 4, 2010. prior to traveling to Chicago. (AP Photo/Charles Dharapak) <span class=meta>( (AP Photo/Charles Dharapak))</span>
August 4, 2010 10:00:00 PM PDT