Liberals and conservatives rely on different sets of moral foundations.

@article{Graham2009LiberalsAC,
  title={Liberals and conservatives rely on different sets of moral foundations.},
  author={Jesse Graham and Jonathan Haidt and Brian A. Nosek},
  journal={Journal of personality and social psychology},
  year={2009},
  volume={96 5},
  pages={
          1029-46
        }
}
How and why do moral judgments vary across the political spectrum? To test moral foundations theory (J. Haidt & J. Graham, 2007; J. Haidt & C. Joseph, 2004), the authors developed several ways to measure people's use of 5 sets of moral intuitions: Harm/care, Fairness/reciprocity, Ingroup/loyalty, Authority/respect, and Purity/sanctity. Across 4 studies using multiple methods, liberals consistently showed greater endorsement and use of the Harm/care and Fairness/reciprocity foundations compared… 

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