Robert Wirch holds a bachelor's degree and has a background in manufacturing, having worked at the American Brass Company plant in Kenosha. He attended night courses at the University of Wisconsin–Parkside. Wirch began his political career by winning a seat on the Kenosha County board of supervisors, serving from 1986 to 1994. He then successfully ran for the Wisconsin State Assembly, where he served multiple terms with significant electoral support. Wirch later transitioned to the Wisconsin Senate, where he maintained a strong electoral record. Throughout his career, Wirch has been involved in various community and veterans' organizations, demonstrating a commitment to public service.

Robert Wirch's political identity is marked by a steadfast commitment to regional economic stability, blending traditional Democratic values with a focus on industrial preservation. His legislative record reveals a calculated approach to environmental regulations, often aligning with opposing factions to safeguard local industrial interests. Wirch's rhetorical style emphasizes community resilience and pragmatic support for dislocated workers, reflecting a unique tension between progressive ideals and localized economic concerns.