As responsible-party theory suggests, Republican and Democratic presidential candidates usually do differ systematically from each other on certain issues, such as

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Responsible-party theory suggests that parties have distinct platforms and positions on issues. Therefore, Republican and Democratic presidential candidates usually differ systematically from each other on a range of issues, including federal aid to education, social welfare, the environment, and abortion, among others. Therefore, the best choice is E, all of the above.

As Responsible-Party Theory Suggests, Republican and Democratic Presidential Candidates Usually