Keith Thomson graduated from the University of Wyoming Law School and practiced law in Cheyenne. He served in the military, rising to the rank of lieutenant colonel, and was admitted to the bar in the same year he graduated. Thomson held positions in state government, including serving in the Wyoming House of Representatives and as a delegate to the Republican National Convention. He was elected to multiple terms in Congress and later to the U.S. Senate, although he passed away before assuming the Senate seat. His wife later served as Wyoming Secretary of State.

Keith Thomson's political identity is marked by a surprising alignment with civil rights advancements despite his conservative roots, suggesting an ideologically agile approach. His support for the Civil Rights Acts of 1957 and 1960 reveals a nuanced stance that challenges typical partisan divides. This unexpected convergence with opposing factions indicates a highly calculated strategy, possibly driven by regional considerations or personal convictions. Thomson's life and career, from his military service to his legislative actions, hint at a complex political philosophy that merits further exploration.