The photo shows a variety of campaign badge attached on the wall of the Obama campaign headquarters in Chicago.  (Photo source: Xinhuanet.com)

Hundreds of Obama campaign volunteers in the Obama campaign headquarters answer calls from the Obama supporters and make "canvassing" phone calls to voters across the country. (Photo source: Xinhuanet.com) 

The photo shows a cartoon of U.S. President Obama and his family members seen in the Obama campaign headquarters in Chicago. (Photo source: Xinhuanet.com)

 

The photo shows the staff members in the Obama campaign headquarters are absorbed in the work for election campaign. (Photo source: Xinhuanet.com)