UPDATE 2-Brazil's Silva launches bid, threatens Rousseff re-election
(Updates with comments from Silva news conference)
By Anthony Boadle
BRASILIA Aug 20 (Reuters) - Environmentalist Marina Silva officially launched a bid for president on Wednesday, upending Brazil's October elections and threatening the ruling Workers' Party's 12-year hold on power.
Silva, until now a vice-presidential candidate for the Brazilian Socialist Party, accepted its nomination to top the ticket after candidate Eduardo Campos, a former governor and rising political star, was killed in a plane crash last week.
Silva pledged to build a more prosperous Brazil and slammed the performance of incumbent President Dilma Rousseff, who has overseen four years of lackluster growth and high inflation in a previously booming economy.
"We know that our country needs investments and they will come when there is a new government that has credibility among investors," she said at a news conference.
Silva reaffirmed her commitment to fiscal responsibility, inflation targeting and a floating exchange rate, the so-called "tripod" of economic policies that gave Brazil stability after a period of rampant inflation and erratic growth in the 1990s.
Viewed as an outsider with no links to traditional elites, Silva is a former environment minister whose ironclad environmental and religious beliefs prompt critics to call her inflexible but supporters to praise her as Brazil's most principled politician.
Silva, a rubber tapper in her youth who was illiterate until adolescence, appeals mostly to young voters disgusted with Brazil's political establishment. Continuación...