Leif Erickson was born in 1906 in Cashton, Wisconsin, and later relocated to western North Dakota. He graduated from the University of Chicago Law School in 1934 and began his career in public service as Richland County District Attorney. Erickson then served as an Associate Justice of the Montana Supreme Court, followed by multiple attempts to become Governor of Montana. He also held various leadership roles within the Democratic Party, including serving as a delegate to the Democratic National Conventions and as Chairman of the Montana Democratic Party.

Leif Erickson's political philosophy reveals a unique blend of progressive economic policies with unexpected environmental conservatism. While advocating for progressive tax reforms and increased infrastructure spending, Erickson simultaneously promoted sustainable agricultural practices and stringent pollution controls, suggesting a calculated approach to balancing economic growth with ecological protection. His commitment to universal healthcare and reduced drug prices aligns with his progressive stance, yet his emphasis on state funding for public education and higher teacher salaries indicates a localized, community-focused strategy. This juxtaposition of progressive ideals with a localized approach creates a compelling tension in his policy framework.