What is the most important factor in predicting how a supreme court justice will vote?

The most important factor in predicting how a supreme court justice will vote is "the justice's ideological predilections".

A predilection is an inclination for or predisposition toward something. In the event that you have a preference for a certain ideology for example a Justice has a soft spot ideologically for Obama administration or for that matter anyone else, this will affect the judgment they make.

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answer; marvin gaye;