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Kansas City, Kansas (CNN) - Republican groups from all corners of the party are reluctantly starting to pour money into this traditionally red state to try to save the incumbent GOP senator - and lock down their prospects of taking control of the Senate.
The Kansas-based Koch brothers, who have so far engaged minimally here, are poised to step up their efforts to help Sen. Pat Roberts, according to sources familiar with their plans.
Worried that Roberts could lose the GOP seat in their backyard, the Koch founded and funded group, Americans For Prosperity, plans to increase its activity in the last weeks of the campaign. Freedom Partners, another conservative group with ties to the Koch brothers, already spent nearly $1 million in television ads to help Roberts and plans another buy before election day.