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Disapproval of the Republican candidate for the vice president of the United States, Sarah Palin, rose nine points this month, according to research released this Friday by the newspaper "New York Times. The survey also indicates that the vice is decisive for at least a third of American voters, making it more difficult to the Republican John McCain to reverse the advantage on Democratic opponent, Barack Obama, in the election next Tuesday. A search of the "NYT" indicates that with 51% of the preference of the electorate, Obama has 11 points of advantage over McCain, who gets 40%. The margin of error is 3%.The newspaper says that 59% of voters consulted said that Sarah, who is governor of Alaska, is not ready to be vice president. At the beginning of the month, the figure was 50%. About the candidate for vice for Obama, Senator Joe Biden, the publication says that approximately three quarters of voters said he is prepared to pursue the job.The research indicates that the Republican candidate improved their performance by insisting on a tax cut, including using the character "Joe, the plumber" to illustrate their proposals and criticizing his opponent. But Obama still has advantage in key subjects such as economics, health and the war in Iraq, says the newspaper.The survey was done between days 25 and 29, with 1439 adults across the country, of which 12% had voted.