Former Wisconsin Democratic Senator Russ Feingold has announced he is running to retake his Senate seat in 2016. Feingold lost the seat he held for 18 years to millionaire Republican Ron Johnson in 2010 after Johnson spent some $9 million of his own money on his campaign. Feingold, who was seen as one of the Senate’s most progressive members, is best known for working with Senator John McCain to pass the McCain-Feingold campaign finance law to restrict money in politics.