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Brazil's Biggest Party Votes to Leave Government &lt;p&gt;&lt;/p&gt;&lt;p&gt; By Tiago Pariz&lt;/p&gt;&lt;p&gt; BRASILIA, Brazil (Reuters) - Brazil's biggest party votedto leave the governing coalition on Sunday in a move that couldcomplicate President Luiz Inacio Lula da Silva's reform agendaand pressure him to give the centrist party extra governmentposts.&lt;/p&gt; 