Former Wisconsin Gov. Tommy Thompson (R) has not announced whether he will enter the race, but polls continue to find he would be competitive in a Senate race against incumbent Russ Feingold (D). A new Public Policy Polling survey finds Feingold leading by just 3 points.

Feingold has a 45%/41% job approval rating, while President Obama has an upside down rating of 46%/48%. Thompson is not particularly popular, with 40% holding a favorable view of him and 44% unfavorable.

Other potential Republican opponents, Dave Westlake and Terrence Wall, are far less well known than Thompson, and a vast majority have no opinion of either.

Feingold 47 - Thompson 44 - Und 9

Feingold 48 - Wall 34 - Und 18

Feingold 48 - Westlake 31 - Und 21

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