"In this study, in which we linked U.S. mortality and election data from 2001 to 2019, people in counties that voted for Republican presidential candidates were more like to die prematurely than those in counties that voted for Democratic candidates, and the gap has grown sixfold over the last two decades. We found similar results when we looked only at counties that voted for one party’s candidate throughout that period, as well as when we used state election data for governors."

And a link to the paper ("Political environment and mortality rates in the United States, 2001-19: population based cross sectional analysis") that the article describes: https://www.bmj.com/content/377/bmj-2021-069308