Political parties are a common occurrence to be found in just about any democracy. Individuals sharing similar ideologies and opinions band together to try and win elections and promote a political agenda that best serves the interests of people pertaining to that ideology and, if you're lucky, other people as well. Likewise, fictional settings that are democracies are typically shown to have political parties which reflect the issues and opinions which characterize the political climate of a story's setting. See Also: No Party Given, Strawman Political, and A Nazi by Any Other Name.