Supporters of U.S. Senator Barack Obama take part in a rally at Iowa State University in Ames

 
Supporters of U.S. Senator Barack Obama take part in a rally at Iowa State University in Ames
Young supporters of U.S. Senator Barack Obama (D-IL) take part in a rally at Iowa State University in Ames, Iowa, February 11, 2007. Obama formally announced his campaign for U.S. President in the 2008 election during a rally in Illinois February 10. REUTERS/Jason Reed (UNITED STATES)