MADISON, Wis (Reuters) - Former Wisconsin governor Tommy G. Thompson filed a statement of candidacy with the Federal Elections Commission on Tuesday declaring his run for the Senate.
Thompson, a Republican, wants to fill the seat being vacated by retiring Senator Herb Kohl, a four-term Democrat. Thompson had already announced his intention to run for the seat last month.
The seat is also being contested by Congresswoman Tammy Baldwin, a Democrat and one of the few openly gay members of Congress.
(Additional reporting by Jeff Mayers; Writing by Mary Wisniewski; Editing by Jerry Norton)