Both Russ Feingold and Sen. Ron Johnson saw an uptick in their fundraising in the second quarter of 2016, but the Democratic former senator continues to outraise his Republican opponent.

Feingold's campaign reported raising $4.1 million in the second quarter, up from $3.3 million in the first quarter. The campaign reported an average contribution of less than $45 per person.

"Middle class and working families from across the state of Wisconsin have pitched in to build a campaign that fights for them — not just the wealthy and corporate interests," Feingold said in a statement. "This campaign continues to be powered by small dollar donors from every county in Wisconsin."

Johnson's campaign raised $2.8 million in the second quarter, up from about $2.1 million in the first three months of the year. The campaign reported having $6.3 million in the bank. Feingold's campaign has not provided cash-on-hand numbers.

"The growing support we’re seeing for Ron proves that people know what’s at stake in this election. In the fight to keep control of the U.S. Senate, the choice in Wisconsin is as clear as it can get – between an Oshkosh manufacturer who is working to solve our problems and keep us safe, and a career politician who got us on the wrong track in the first place," said Johnson spokesman Brian Reisinger.