The anonymously financed conservative groups that have played such a crucial role this campaign year are starting a carefully coordinated final push to deliver control of Congress to Republicans, shifting money among some 80 House races they are monitoring day by day.

Officials involved in the effort over the midterm elections' final week say it is being spearheaded by a core subset of the largest outside conservative groups, which have millions of dollars left to spend on television advertisements, mailings and phone calls for five potentially decisive Senate races, as well as the scores of House races.

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