Feingold said not every voter he meets in Wisconsin is angry.

"Well, look. Some people are angry, some people are not angry. But people do want change, and they do want fairness," Feingold said. "And what I’m hearing is we do not have fairness when it comes to the middle class and working families being able to pay their bills and make ends meet. So I feel that as long as people make it clear that that’s the main issue, that this campaign is going to go well in our race and also I think on the Democratic side, because our candidates are much more in tuned to the question of how families can make ends meet."

While Feingold has maintained a substantial lead over Republican Sen. Ron Johnson since before he announced his candidacy in April 2015, the former senator isn't complacent.

Feingold as the support of 49 percent of Wisconsin voters, compared to the Johnson's 37 percent. Johnson ousted Feingold with a 5-point victory in 2010.

"This race will be much closer than the polls show. I do not take those kind of numbers seriously," Feingold said. "I am working as hard as I’ve ever worked in my life because so much is at stake for our country, all the way from the issue of the Supreme Court to the issues of working families that are illustrated by this very unfair TPP agreement. So that’s what I'm going to focus on. The rest will take care of itself on Election Day. But I am not going to kid myself for one minute that this isn’t a tough fight, and I'm going to fight as tough as I know how."

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