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Answer:
Constituents, interest groups, and political parties use different kinds of leverage to influence the votes of congressional representatives. Constituents are powerful because they can vote out members who do not represent their interests. Sometimes, however, interest groups and political parties hold more sway over members because they provide money and logistical support for campaigns.
Explanation:
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In congress political parties serve to coordinate, assistant and provide ... party leaders on individual members including higher rates of party voting. ... set legislative priorities, and determine who will receive important committee appointments. ... Interest groups attempt to influence Members of Congress in a variety of ways