When Marina Silva was a child, living with six sisters and a brother in a wooden shack deep in the Amazon rain forest, her father, a rubber tapper, would listen to Voice of America and the BBC Portuguese service on his radio. “My father was addicted to the news,” she says, recalling how “one time, I thought there were people inside the radio, and I opened it to see.” In a family where no one could read, the radio was the only source of news, and it gave her “an idea that a world existed beyond the place we lived in.” Attention in that world beyond suddenly shifted to Silva when she made a dramatic entrance into the Brazilian presidential race after the Socialist Party candidate Eduardo Campos was killed in a plane crash on Aug.