<P> On May 14, 2015, Feingold announced his candidacy for U.S. Senate against the incumbent, Republican Ron Johnson . </P> <P> In his 2016 campaign, Feingold said he would no longer adhere to his longstanding pledge to raise the majority of his campaign funds from Wisconsin residents . Feingold said the pledge had been made on an election - to - election basis and no longer made sense . As of March 2016, Feingold had raised the most money among all U.S. Senate candidates challenging an incumbent . Nearly three - fourths of his individual contributions were from outside Wisconsin . </P> <P> Groups financially supporting Feingold's election bid included Planned Parenthood, the League of Conservation Voters, American Bridge 21st Century, and the National Abortion Rights Action League . In May 2016, Senator Bernie Sanders endorsed Feingold and engaged in fundraising for him . </P> <P> In the November 8, 2016, general election, Feingold was defeated by Johnson . Feingold received slightly less than 47%, and Johnson received slightly more than 50%, of the vote . </P>

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