Mike Mansfield died on this day 16 years ago. To commemorate the longest-serving Senate Majority leader and a person who is my favourite senator I decided to map his every (contested) election from the 1940 Democratic primary for the 1st Montana's congressional district to his last general election to the Senate in 1970. Mansfield's electoral history has started with 1940 Democratic primary for the 1st Montana's congressional district which was a three-way race between former Rep. O'Connell, Montana's Lieutenant Governor Hugh Adair, and Mike Mansfield. O'Connell won, while only receiving 33% of the vote with Adair coming in second place with 29%. Manfield came third with 25% while managing to win Missoula county which was the second-most populous county in the 1st district at that time. O'Connell then went on to lose the general election to Jeannette Rankin, the first-ever congresswoman. In 1942 Rankin retired and the seat was open. The Democratic pr