Lot M. Morrill began his career in education, transitioning to law after studying under Justice Fuller. He established a successful legal practice and became involved in state politics, initially with the Democratic Party. Morrill later diverged from the Democratic platform, joining the Republican Party in 1856 and holding various state-level offices, including serving as governor of Maine. His national political career included a brief tenure as Secretary of the Treasury under President Ulysses S. Grant.

Lot M. Morrill's political career is marked by a strategic ideological shift from Democratic to Republican, driven by his opposition to Democratic concessions on slavery. His tenure as Secretary of the Treasury, though brief, suggests a commitment to financial integrity rather than technical expertise. Morrill's ability to navigate complex political landscapes and align with opposing factions on key issues, such as environmental regulations, reveals a highly calculated approach to policymaking.