Elizabeth Masden was born May 23, 1979, on the Spokane Indian Reservation in the city of Wellpinit, Washington. Elizabeth's family ranched and farmed just outside of the community, and despite this, her family still struggled economically. She was soon taken under the wing by a member of the Tribal Council, who helped her get the recommendation to attend the private Catholic Gonzaga Preparatory School in Spokane. After graduating from Gonzaga Prep she went on to enroll in Gonzaga University, seeking a degree in business administration and communications. While enrolled at Gonzaga Elizabeth met fellow Spokane tribe member, Joseph Browneagle, and the two quickly got married, and after both graduated from Gonzaga moved back onto the family ranch and their family quickly grew with the births of their two sons.
Elizabeth soon got a job as the head of the Natural Resource/Land Committee on the Affiliated Tribes of Northwest Indians, a nonprofit representing a multitude of tribes throughout the Pacific and Mountain Northwest region. She worked on that committee representing and fighting for native values of responsible and sustainable land management and ownership. Once her children grew a bit older she decided to run for Tribal Council of the Spokane tribe and was soon elected as a Chairwoman, representing her community on the tribal council. Soon thereafter she was promoted to the Executive Council of the ATNI, further growing her political influence in Eastern Washington, especially amongst the native people.
In 2015, she announced she would challenge Cathy McMorris-Rogers for Washington's Fifth Congressional District. She was able to turn out young, minority, and new voters in droves thanks to a social media, and twitter campaign aimed at exciting a progressive base of voters, with the support of typically liberal policies such as a move towards renewables, Medicare for all, and tuition-free college. However, she was able to maintain support among the areas many conservatives by proclaiming she was personally pro-life, while politically pro-choice, and also an advocate for responsible second amendment rights, being a gun owner herself.