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By Alana Wise and Jeff Mason PHILADELPHIA (Reuters) - Democratic vice presidential nominee U.S. Senator Tim Kaine laid into Republican candidate Donald Trump on Wednesday, describing the billionaire as "a one-man wrecking crew" who cannot be trusted with America's future. "Our nation, it is just too great to put it in the hands of a slick-talking, empty-promising, self-promoting, one-man wrecking crew," Kaine said in a keynote speech to the Democratic Party convention in Philadelphia. Democratic presidential nominee Hillary Clinton chose Kaine of Virginia, as her running mate last week, opting for a partner at the Nov. 8 election who has wide experience in public service to draw a contrast with Trump who has never been elected to office.