Kenya's President Mwai Kibaki (C), Prime Minister Raila Odinga (L) and Vice President Kalonzo Musyoka release pigeons as a sign of peace at a rally to launch campaigns for the Constitution Referendum in the capital Nairobi, May 15, 2010. As Kenyans prepare to vote in a referendum on constitutional reform in August, many remain haunted by the tribal bloodletting that convulsed east Africa's largest economy in early 2008. Photo/REUTERS