3/4/08 any party other than the primary two is called a third party 3 factors that give rise to the two party system: election system effects of presidency general division of interests into two camps election system is usually based on single member districts or proportional distribution single member districts elect only one member at a time candidate needs a plurality to win (the most, not necessarily a majority) winner take all system fuels tendency for groups in a district to combine forces to get a common candidate elected proportional representation: seats may be divided based on percentage of votes encourages multiple parties coalitions formed AFTER election tend to be less stable single party interests prop up dual party system effects of presidency: electoral college is winner take all for members from states polarization of interests on any issue tends to divide people into two groups instead of many divisions occur continuously third parties tend to hit the extremes the most successfull third parties were the populists, progressive bull moose party, independent party, states rights party, libertarian party, green party australian ballot - printed at government expense, has ALL candidates, secret ballot almost all major issues will find a home in one of the two major parties to qualify for public funding, party must get at least 5% of the popular vote in the last election leadership tends to be more extreme within a party any laws relating to parties are state laws not necessarily the same between democrats and republicans states determine voting requirements interest groups tend to support a single party and a single interest or small group of interests parties tend to have a broader group of issues people join interest groups for practical or financial purposes private interest groups governmental interest groups economic professional IG that try to affect government in some way aggregate influence for people PIGs and the media act as intermediaries between gov't and people also do a lot of the compromise and election contestation compete amongst themselves for resources interest groups want your money, name, and volunteer work, not suggestions keywords: moneyline.cq.com single-member districts plurality proportional representation