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nr preston intv gop showing gains in senate race_00023517.jpg
nr preston intv gop showing gains in senate race_00023517.jpg

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    Should Senate Democrats be worried?

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Should Senate Democrats be worried?

GOP candidates are showing gains in key Senate races. CNN's political editor Mark Preston analyzes what's at stake.

Should Senate Democrats be worried?

GOP candidates are showing gains in key Senate races. CNN's political editor Mark Preston analyzes what's at stake.