MADISON (WSAU) The only Democratic candidate for Wisconsin’s open U-S Senate seat has raised more campaign money than her four Republican challengers combined. Madison Congresswoman Tammy Baldwin raised $2.2-million from April-through-June in her bid to replace the retiring Herb Kohl in November.

Former Governor Tommy Thompson has raised the most among the four Republicans who will square off in a primary four weeks from today. Thompson brought in almost $834,000 in the last quarter, and former Congressman Mark Neumann took in $733,000. Hedge fund manager Eric Hovde raised $237,000. But he has spent an estimated $3-million dollars of his own money on T-V ads over the last few months to get himself known. State Assembly Speaker Jeff Fitzgerald took in $41,000, and he’s the only one who has not run a T-V ad yet. Thompson has spent about $32,000 of his own money this year. The Neumann camp says their man has not spent any of his own cash. But Neumann has been helped by the national conservative Club-for-Growth, which recently spent $700,000 on ads that attacked both Thompson and Hovde.

U-W La Crosse professor Joe Heim says the Republican fund-raising has been relatively low so far. He says it appears that the recall effort against Governor Scott Walker quote, “tapped out a lot of traditional Republican sources.”