Having decided against a 2004 presidential bid, once-and-future candidate Gary Hart is preparing to throw his hat in the ring for another campaign: his old U.S. Senate seat in Colorado.

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Having decided against a 2004 presidential bid, once-and-future candidate Gary Hart is preparing to throw his hat in the ring for another campaign: his old U.S. Senate seat in Colorado. Why would the 66-year-old reenter the political arena when he's already passed up the big prize? Hart reportedly believes that he can provide much-needed expertise on national...