Supporters of Bolivia's President Evo Morales chew coca leaves as they attend the CSUTCB (Bolivian Farmers' Unions) anniversary celebration in La Paz, June 26, 2012. Morales, a leftist leader who is Bolivia's first indigenous president, has faced increasingly thorny social conflicts in the past year in the Andean nation.REUTERS/David Mercado (BOLIVIA - Tags: POLITICS BUSINESS EMPLOYMENT ANNIVERSARY SOCIETY)