A supporter of Iranian presidential candidate Mir Hossein Mousavi (picture) attends a campaign rally in Tehran on May 23, 2009. Iran's former reformist president Mohammad Khatami openly threw his weight behind ex-premier Mousavi, who is contesting the June 12 presidential election. Khatami addressed the rally attended by a cheering crowd of men and women, many dressed in Mousavi's trademark colour green or wearing green scarves or wristbands. TOPSHOTS/AFP PHOTO/ATTA KENARE (Photo credit should read ATTA KENARE/AFP/Getty Images) Photo: Atta Kenare, AFP/Getty Images