By analyzing publicly available data on political contributions, Crowdpac's algorithm calculates objective political ideology scores for candidates, donors, organizations - and in this case, states. We calculated a score for each state based on the political donations of the people who live there, using campaign finance records from 2004 to 2016. Scores range from 10L (most liberal) to 10C (most conservative).

We then mapped these 'state political leaning' scores against official data on gun-related deaths per capita. As it turns out, there is a significant correlation (.66) between a state's political leaning and the number of gun deaths it registers.

States with a conservative ideological score (1C to 10C), show significantly higher rates of gun-related deaths than states with liberal scores (1L to 10L).

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