Paul Ryan is retiring. This man wants to take his seat in the House.

YouTube link.

Paul Ryan currently represents Wisconsin's 1st congressional district (the Milwaukee area).   The Republican who wants to take his place is Paul Nehlen, a white nationalist.  Paul Ryan does not endorse him:

“There are many qualified conservatives who would be effective representatives for Wisconsin’s 1st Congressional District, and Paul Nehlen isn’t one of them,” said Kevin Seifert, the head of Ryan’s political operation. “His bigoted rhetoric and his reprehensible statements should disqualify him from holding any public office and we are confident voters in Southern Wisconsin feel the same way.”

There are currently three other candidates - one Republican and two Democrats (links with information about each at Ballotpedia).

To me, the most interesting one is Randy Bryce. who was featured in a recent article at Vox:

Bryce is a union ironworker and Army veteran. He was a Bernie Sanders supporter in 2016, serving as a Sanders delegate from Wisconsin during the Democratic National Convention. He’s proud of his working-class roots — unlike a lot of other candidates, it’s typical to see Bryce standing on a construction site with a hard hat on in his campaign ads, rather than wearing a suit...

He’s indicated he’s a different kind of Democrat, and has also been cautious when talking about whether he would support House Minority Leader Nancy Pelosi if she were to run for speaker if Democrats can retake the majority in 2018...

Bryce is a supporter of Medicare-for-all and has said he would sign on to the bill that is currently proposed in the House. He’s running on a platform that focuses mostly on jobs and the economy and has made infrastructure a huge focus of his campaign...

I've embedded his first campaign video above.  It's very effective.