What factor is the single most important predictor of how a member of Congress will vote on a bill?

Question

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Political party affiliation has consistently proven to be the most significant and reliable predictor of how a member of Congress will vote on a bill. Members of Congress often vote in line with their party's ideology and policy priorities, as well as to maintain party solidarity and support from party leaders. While other factors such as the president's position, committee leadership, and citizen preferences can influence a member's vote, party affiliation remains the strongest determining factor.

What Factor Is the Single Most Important Predictor of How