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Martin-Quinn ideological scores of Supreme Court justices in the United States from 2005 to 2022

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Release date

July 2023

Region

United States

Survey time period

2005 to 2022

Supplementary notes

Martin-Quinn scores, or MQ scores, are dynamic metrics used to gauge the ideology of a U.S. Supreme Court Justice based on their voting record. A jurist's score will continuously change as each judicial decision they make creates a new data point to be input into the model. MQ scores theoretically have no minimum or maximum values, but scores generally fall between -5 and 5. A negative number indicates a tendency towards liberalism, while a positive score indicates a tendency towards conservatism.

Figures have been rounded.

*Preliminary scores

Citation formats

U.S. Supreme Court justices ideological MQ scores 2005-2022

Published by ÌÇÐÄÆƽâ°æ Research Department, Jul 3, 2023

For the 2022 Supreme Court term, it is estimated that Justice Samuel Alito was ranked as the most conservative justice by the Martin-Quinn scores method. Justice Sonia Sotomayor was ranked as the most liberal. The 2022 Supreme Court consisted of *** conservative justices, and liberal.

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