Russ Feingold

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Democratic U.S. Senate candidate Russ Feingold delivers his concession speech in Middleton, Wis., Tuesday, Nov. 8, 2016. Feingold lost to Republican Ron Johnson. (John Hart/Wisconsin State Journal via AP)

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Republican U.S. Sen. Ron Johnson (left) and Democrat Russ Feingold (right) meet before their second and final debate Tuesday, Oct. 18, 2016, in Milwaukee, Wis. (Mark Hoffman/Milwaukee Journal-Sentinel via AP)

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U.S. Sen. Ron Johnson, R, right, prepares for a debate Friday, Oct. 13, 2016, with Democratic challenger Russ Feingold, a former U.S. senator, at the studios of WLUK Fox 11 in Green Bay, Wisc. (Sarah Kloepping /The Green Bay Press-Gazette via AP)

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Actor Ben Affleck, left, and US Special Envoy for the Great Lakes Region of Africa Russ Feingold, speak about Congo as they are interviewed by the Associated Press at the State Department in Washington, Wednesday, Feb. 26, 2014. Affleck and Feingold are schedules to testify on Capitol Hill before the Senate Foreign Relations Committee hearing on prospects for Peace in the Democratic Republic of Congo and Great Lakes Region. (AP Photo/Charles Dharapak)

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Rep. Tammy Baldwin, Wisconsin Democrat, appears to have an opening for the U.S. Senate primary now that former Sen. Russ Feingold has bowed out. (Associated Press)

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Sen. Russ Feingold, Wisconsin Democrat, makes his concession speech to supporters Tuesday night in Middleton, Wis., after losing to Republican challenger Ron Johnson. (Associated Press)

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Wisconsin Republican Ron Johnson, a political novice, celebrates his victory over veteran Democratic Sen. Russ Feingold Tuesday night in Oshkosh, Wis., with family and supporters. (Associated Press)

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FILE - In this Jan. 25, 2006 file photo, Sen. John McCain, R-Ariz., left, chats with Sen. Russ Feingold, D-Wis. on Capitol Hill in Washington. The Supreme Court did not scale back the hard-won 2002 Bipartisan Campaign Reform Act, also named the McCain-Feingold law after its sponsors, and let corporations, unions and wealthy individuals pour money into elections in time for this year's congressional races, not to mention the 2012 presidential contest; a ruling is expected as early as Tuesday, Jan. 12, 2010. (AP Photo/Lauren Victoria Burke, File)

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Supreme Court nominee Elena Kagan meets Sen. Russ Feingold, D-Wis., on Capitol Hill in Washington on Wednesday, May 19, 2010. (AP Photo/Manuel Balce Ceneta)