EMERGING MARKETS-Brazil stocks extend sell-off on election outlook

SAO PAULO, Sept 30 (Reuters) - Brazilian stocks extended their slide on Tuesday, a day after posting their biggest one-day loss in over three years, as investors priced in a higher likelihood of President Dilma Rousseff winning a second term. A poll released late on Friday by research firm Datafolha showed Rousseff with 47 percent of voter support against Silva's 43 percent in a potential second-round runoff. Another poll released just before the market close on Monday showed Rousseff with 4