WALWORTH COUNTY — House Speaker Robin Vos has served at the State Capitol for more than 20 years and State Senator Stephen Nass has represented Walworth County in Madison since 1991. TMJ4 Wisconsin State Senator Stephen Nass. Watch: Walworth County voters find out who could replace House Speaker Robin Vos and State Senator Stephen Nass...State Assembly Seats 11, 33 up for grabsA total of nine candidates vied for Vos and Nass' seats on Tuesday. Republican Party of Walworth County chairman Chris Goebel said it will be hard to replace Vos and Nass' presence in Madison. However, some Walworth County voters such as Jim Schweitzer said they are ready for a change in representation.