EMERGING MARKETS-Brazil's Bovespa extends rally on election outlook; Oi, TIM soar

SAO PAULO, Aug 27 (Reuters) - Brazil's benchmark Bovespa stock index rose to its highest level in 19 months on Wednesday after two polls suggested President Dilma Rousseff may lose her re-election bid in October. The broader MSCI Latin American stock index rose its most in over two weeks, while the region's currencies were mixed. A widely watched poll released on Wednesday showed Rousseff losing to environmentalist Marina Silva in an expected runoff, echoing the results of another poll