(Source: MIRS.news, Published 01/20/2023) Assuming everything goes as planned and U.S. Sen. Debbie Stabenow (D-Lansing) retires after 24 years in the U.S. Senate at the end of 2024, she will go down in history as Michigan's second-longest tenured U.S. Senator, following former U.S. Sen. Carl Levin.