Purposes. As a reminder, a political party is a group of people who organize to win elections, operate the government, and determine public policy, whereas an interest group is a group of people who share common goals and who actively try to influence policymakers.Parties and interest groups are similar in many ways: Both are organized ... In modern democracy, political parties and interest groups play prominent roles in government. ... The primary difference between a political party and an interest group is the purpose that each serves. .... Relationship Between Primary & Caucus.
