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By Steve Barnes HOPE, Ark. (Reuters) - Republican Mike Huckabee entered the race for his party's 2016 presidential nomination on Tuesday, looking to break out from an ever-widening field by drawing on the support of social conservatives attuned to his culture-warrior message. In a speech filled with fiery rhetoric, Huckabee, a former governor of Arkansas, said that, if elected, he would change government policies to focus more on the economic plight of middle-class Americans. He was also tough on Islamic State, saying he would change the U.S. approach from attempting to contain the militant group and instead would "conquer" it. Huckabee vowed strong U.S. support for Israel and took a dim view of negotiations aimed at deterring Iran from developing a nuclear weapon.