"What’s going to fuel people to want to get involved, to want to invest in me as a leader and the ideas I represent, are what am I going to be for, how are we going to make our lives better in the next 10, 20 years with the ideas that I want to bring to Congress and that’s the only way we’re going to be able to raise a lot of money and get the kind of organization we need to win this district," he said.

There are few other publicly contested congressional races so far in Wisconsin. In the northeastern 8th District, Democratic state Rep. Amanda Stuck has announced a challenge to GOP U.S. Rep. Mike Gallagher, while first-time Democratic candidate Matt Boor is running against U.S. Rep. Glenn Grothman, R-Glenbeulah, in the eastern 6th District.

Meanwhile, Republican Cindy Werner has registered her candidacy with the Federal Elections Commission for the Milwaukee-area 4th District, which is held by Democratic U.S. Rep. Gwen Moore. She has previously run for the seat.

Other candidates, meanwhile, have registered as primary opponents to some incumbent House members, according to filings posted at the FEC.

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