By Steve Barnes HOPE, Ark. (Reuters) - Republican Mike Huckabee announced a run for his party's 2016 presidential nomination on Tuesday with a fiery, populist speech aimed at energizing support from the Christian right and blue-collar Americans struggling to make ends meet. The 59-year-old former Arkansas governor and former host of a popular Fox News television show is a long shot in the widening race to represent the Republican Party in the November 2016 election. Huckabee is the sixth Republican to make a formal bid. The former Southern Baptist pastor rode support from social conservatives opposing abortion rights and gay marriage to an early surprise victory in the 2008 White House race.