Brazil's Rousseff holds clear lead, rivals make gains - poll

BRASILIA (Reuters) - President Dilma Rousseff holds a clear lead ahead of Brazil's election in October, but her main rivals are closing the gap as voters begin to decide who to back, according to a poll published on Thursday.

While Rousseff still has enough of an advantage to win re-election in a first round vote if it were held today, her opponents gained more ground from growing media exposure as the campaign begins to shift gear, making a run-off more likely.