REUTERS/Matias Baglietto/File PhotoBUENOS AIRES, Aug 4 (Reuters) - Argentina's opposition is polling with a slight lead for the upcoming August primaries, usually a reliable bellwether for the outcome of the presidential election, but with many voters ready to snub the ballot box the results are far from certain. Most polls peg the center-right opposition alliance Together for Change (JxC) with a slight edge against the center-left ruling coalition Union for the Homeland (UP). Over 10 percentage points behind is political outsider Javier Milei's Liberty Advances party, which hopes to win votes from those disillusioned with politics. The primaries will decide the candidates who will compete in the Oct. 22 elections, but polls vary on which candidates will win a place in the race. Massa is seen as likely to win a place in the presidential vote, but the country's severe economic crisis has favored Milei, who carries an "emotional vote".

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Persons: Javier Milei, Matias Baglietto, Carlos Fara, Javier Milei's, Mariel Fornoni, Horacio Rodriguez Larreta, Patricia Bullrich, Bullrich, Sergio Massa, Juan Grabois, Massa, Milei, Pollsters, It's, Lucila Sigal, Juan Bustamante, Sarah Morland, Sandra Maler Organizations: 135th Argentine, REUTERS, Union for, Homeland, Management, Economy, Reuters, Thomson Locations: Buenos Aires, Argentina, BUENOS AIRES, UP, Fara