Victories in the March 4 GOP primaries in Ohio, Texas, Rhode Island and Vermont helped Arizona Sen. John McCain secure his party's presidential nomination. New York Sen. Hillary Clinton's campaign got a much-needed boost when she took both Ohio and Texas. Here are excerpts from the following candidates' March 4 speeches, including New York Sen. Hillary Clinton; Arizona Sen. John McCain; Illinois Sen. Barack Obama and former Arkansas Gov. Mike Huckabee:
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