Marina Silva, shown here in Rio de Janeiro on Wednesday, is tied in polls with incumbent President Dilma Rousseff. Silva, the candidate for Brazil's Socialist Party, says if elected next month, she would be "the first social environmentalist president." Silvia Izquierdo/AP hide caption

itoggle caption Silvia Izquierdo/AP

Lourdes Garcia-Navarro with her husband, James Hider, and their dogs Nena (left) and Ursa. Tara Todras-Whitehill/Lourdes Garcia-Navarro hide caption

itoggle caption Tara Todras-Whitehill/Lourdes Garcia-Navarro

Evangelical Christians hold their hands out in prayer during the annual March for Jesus in downtown Rio de Janeiro, Brazil, in 2013. Evangelicals play an increasingly large role in the nation's politics. Victor R. Caivano/AP hide caption

itoggle caption Victor R. Caivano/AP

Paulo Ito's picture of a starving child left to dine on a soccer ball has been shared more than 50,000 times on Facebook. Andre Penner/AP hide caption

itoggle caption Andre Penner/AP