Charles Croswell began his career in law and public service at a young age, studying under the mentorship of a county clerk. He transitioned from carpentry to law, gaining early public sector experience during the Mexican-American War. Croswell's career included pivotal roles in local and state government, such as City Attorney of Adrian and Mayor, and he was elected to the Michigan Senate multiple times. His leadership was marked by significant legislative achievements, including the reduction of public debt and the establishment of laws against election corruption. Croswell also played a key role in the construction and opening of state institutions and the new capitol building at Lansing.

Charles Croswell's political identity is marked by a meticulous approach to fiscal responsibility and institutional integrity. He championed reducing public debt and enforced strict financial controls, yet his commitment to social welfare is evident through his active role in the State Board of Corrections and Charities. Croswell's rhetorical style seems to blend a no-nonsense attitude towards fiscal matters with a compassionate engagement in social issues, creating an intriguing ideological balance. His unexpected legislative alliances on environmental regulations hint at a highly strategic approach to policymaking, balancing regional industrial interests with broader public welfare.