By Anthony Boadle BRASILIA (Reuters) – President Dilma Rousseff is leading her closest rival Marina Silva by nine percentage points for a likely second-round runoff to Brazil’s presidential election, a new opinion poll showed on Monday. Rousseff would win the runoff with 47.7 percent of the votes against 38.7 percent for Silva, widening her lead from the one-point advantage she had in the previous survey by polling firm MDA last week. The first round of Brazil’s presidential election is on Sunday. If no candidate wins more than 50 percent of the valid votes, the election will be decided on …

RELATED ARTICLESMORE FROM AUTHOR