(CNN) – CNN Thursday turned the important battleground state of Wisconsin from "lean Obama" to true "toss up" on its electoral map, in the wake of Mitt Romney's naming of House Budget Chairman Paul Ryan, a seven term congressman from the Badger state, as his running mate.

One contributing factor behind CNN's move was a new poll that matched two others from last week that indicate that the presidential contest in Wisconsin is close. While Ryan's announcement did not dramatically alter the presidential poll numbers in Wisconsin, it did change the way both campaigns viewed the state of the race in the state.

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