TOPSHOTS A demonstrator empties a bucket of water in front of the Brazilian National Congress, in Brasilia, on January 30, 2013 during a demonstration called by Rio de Janeiro's "River of Peace" Movement symbolizing the need for "cleaning" the senate of corruption. This week the presidential election will be held in the federal senate and the favorite candidate, senator Renan Calheiros, has been the target of many accusations of corruption. AFP PHOTO/PEDRO LADEIRA