Sen. Russ Feingold (D-Wis.) and his Republican opponent are trading shots over their stock portfolios. But in Feingold's case, his investments appear less of a liability.

The senator released a statement Thursday expressing regret he was unable to make the Green Bay Packers annual shareholder meeting. "However, I want to make it clear that I will not be divesting my one share in the Packers," Feingold said. "Not because it's the only stock I own, or because market conditions predict a Super Bowl, but because I am a committed Packer fan whether they are up or down."

Businessman Ron Johnson (R), meanwhile, owns BP stock valued between $116,000 and $315,000, which has drawn criticism from Democrats.

"The Republican bailout of BP might make Johnson’s stock portfolio happy, but it's not going to do anything to help the people of Wisconsin," a spokeswoman for the Democratic Senatorial Campaign Committee said in a statement Thursday.

Johnson had suggested he would sell the stock and use the money for his Senate run. But this week he balked. "I think that will eventually happen, but I'm going to do it based on market conditions," Johnson told reporters. "I'm going to have to finance this campaign. ... At some point in time, to get my message out, that will probably happen. But it's going to be based on market conditions."

The latest Rasmussen survey of 750 likely voters in Wisconsin shows Johnson getting 48 percent of the vote and Feingold netting 46 percent.