A new Public Policy Polling survey in Wisconsin finds Sen. Herb Kohl (D-WI) leads by anywhere from 7 to 15 points in hypothetical contests against the trio of Republicans tested as possible challengers.
If Kohl decides to retire, Sen. Russ Feingold (D-WI) would start out with nearly identical poll numbers against this trio of Republicans.
Also interesting: "Feingold remains a pretty popular figure with Wisconsin voters. 51% rate him favorably to only 39% with a negative opinion. That may seem counterintuitive just four months after he was defeated for reelection, but the reality is he didn't fall out of favor with Wisconsinites as a whole, just the Wisconsinites who bothered to vote in last year's midterm election where Democratic turnout was fatally low. With a Presidential year electorate Feingold's standing is pretty solid."