Actually, Wisconsin has mulitiple senators. There are senate districts. Including Madison’s Tammy Baldwin. Maybe look it up before commenting next time.
https://www.numbersusa.com/content/my/congress/11082/votingrecord
https://www.numbersusa.com/content/my/congress/11082/votingrecord#tabset-3
https://www.numbersusa.com/content/my/congress/11082/votingrecord#tabset-5
Couple articles about your fine Senator Johnson.
Each of the two Senators represents the entire state. You need to find an 8th grade civics book and do some remedial studies.