The biggest movement at the top of the list in the latest rankings if the Massachusetts Senate race between Democrat Elizabeth Warren and Republican Sen. Scott Brown. That race moved from sixth most likely to result in a change in partisan control to fourth most likely.
The top three spots, Nebraska, Maine and Montana are unchanged from last month. The much-watched Missouri race between Republican Rep. Todd Akin and Democratic Sen. Claire McCaskill went from ninth most likely to change partisan control to 10th.
Read the full list and analysis here.
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