Is the Result of 2007 Philippine Election CREDIBLE?

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There were lots of rumors regarding the different types of frauds during the last concluded 2007 senatorial election. There were rumors that those person who have been defeated will file a protest case because they were "NADAYA" or cheated . But the big QUESTION is, why this really happen? What is in with the Philippine Politics that there are some people who are capable of getting rid of thier opponents just to win?