State Assembly Speaker Jeff Fitzgerald officially announced Tuesday that he will run for the U.S. Senate in November 2012.
The Republican from Horicon is perhaps best known for his role in the controversial legislation . He told the Associated Press that was his biggest asset in the race.
Other Republicans who have announced their intention to run are former Gov. Tommy Thompson and former U.S. Rep. Mark Neumann. Two others, state Sen. Frank Lasee and Madison investor Eric Hovde, are also considering a run, the AP reported.
U.S. Rep. Tammy Baldwin has entered the race on the Democratic side.
The candidates are battling to replace U.S. Sen. Herb Kohl, who .