The primary difference between a the purpose that each serves. political parties exist to gain power over governmental policy by winning elections for political office. they do this by supporting candidates for offices and them win elections through advertising and fundraising. they have official opinions on a wide variety of issues, but these are subject to change. an interest group's goal is to promote a position on a specific issue such as gun control or agriculture. interest groups do not necessarily have their members run for office, and they vote in a nonpartisan way, supporting candidates who promote their point of view.

Horton automatics and the industrial division of the communications workers of america, the union that represented horton’s workers, negotiated a collective bargaining agreement. if an employee’s discharge for a workplace-rule violation was submitted to arbitration, the agreement limited the arbitrator to determining whether the rule was reasonable and whether the employee had violated it. when horton discharged employee ruben de la garza, the union appealed to arbitration. the arbitrator found that de la garza had violated a reasonable safety rule, but “was not totally convinced” that horton should have treated the violation more seriously than other rule violations. the arbitrator ordered de la garza reinstated. can a court set aside this order