Topic 4.3 Notes – Political Party Systems

What Political Party Systems Are

A political party is an organization that tries to control government. In democracies, that usually means winning elections and placing members in office. In authoritarian systems, it can mean monopolizing power.

A party system is the pattern of competition and power among parties. You are not just counting parties. You are asking whether they matter.

What tells you what kind of party system a country has:

• Legal parties matter, but they do not settle the question. China has multiple legal parties, yet only the CCP can rule.
• Meaningful competition matters more. Can opposition parties actually win power, or only exist?
• Alternation in power is huge. If power can change hands through elections, competition is more real.
• Rules of access shape outcomes. Registration laws, ballot access, and media access can open or close competition.
• Party organization matters too. Some parties are durable institutions. Others are loose networks around one leader or faction.

Party membership can mean different things:

• in democracies, it might mean enrolling, paying dues, campaigning, or identifying with a party
• in authoritarian systems, it can also be a route to jobs, status, and promotion

That is why party systems reflect regime values. Democracies stress choice and representation. Authoritarian systems stress order, centralism, and control.

Main Types of Party Systems

These categories help, but real countries can sit between them.

• One-party system: only one party can actually govern.
  • China fits here.
• Dominant-party system: other parties exist, but one party keeps control because it has major advantages.
  • Russia under United Russia
  • Mexico under the PRI before democratization
• Multiparty system: several parties can compete and win representation.
  • Mexico today
  • Nigeria formally
• Two-party dominance: many parties may exist, but two dominate national politics.
  • United Kingdom
• Factional or weak-party environment: stable formal parties are weak, and politics runs through shifting alliances.
  • Iran with principlists, reformists, and moderates

A catch-all party tries to win support across ethnic, religious, regional, or class lines. It uses a broad platform instead of a narrow ideology. That is different from a coalition government, which is multiple separate parties governing together.

Course Country Patterns and Key Examples

Keep these six course countries in mind as you review party systems and patterns of competition.

• China
  • The CCP has monopolized governing authority since 1949.
  • Eight other recognized parties exist, but only for consultation under CCP leadership.
  • Membership can be selective and useful for career advancement.
• Russia
  • United Russia dominates.
  • Opposition parties like the CPRF and LDPR exist, but cannot realistically replace it.
  • Dominance is protected by stricter registration, ballot limits, selective disqualifications, weak media access for opposition, threshold rules, and the 2004 elimination of gubernatorial elections with only restricted restoration in 2012.
• Mexico
  • The PRI dominated from 1929 to 2000.
  • Its decline came from ending el dedazo, privatization reducing patronage, decentralization, and a stronger IFE/INE.
  • Vicente Fox of PAN winning in 2000 showed real alternation.
  • Later competition included PRI, PAN, PRD, and now Morena as the leading force.
• Nigeria
  • About 30 registered parties, but the PDP and APC lead competition.
  • The APC victory in 2015 was the first electoral transfer of executive power.
  • The Labour Party had a strong third-party showing in 2023.
  • Major parties are broad catch-all coalitions.
• United Kingdom
  • Conservatives and Labour dominate nationally.
  • Minor parties still matter, including the Liberal Democrats, SNP, Plaid Cymru, and Northern Irish parties.
  • In 2019, Conservatives won 43.6% of the vote and 365 seats; Labour won 32.1% and 202 seats; the SNP won 3.9% and 48 seats because support was concentrated.
• Iran
  • Weak party institutionalization means shifting factions matter more than durable parties.
  • The Guardian Council vets candidates before elections, which limits competition from the start.

What Shapes Competition and Representation

Rules decide whether parties can truly compete. Electoral systems matter here too, because they shape how votes turn into seats.

Key mechanisms include:

• registration requirements that can keep challengers off the field
• ballot access rules that decide who voters can even choose
• electoral thresholds that block smaller parties from seats
• candidate vetting or disqualification that removes threats early
• media access that shapes what citizens hear
• patronage and state resources that reward supporters
• decentralization or centralization that can widen or narrow openings for opposition

The exam loves cause-and-effect here. Say the rule, then the result. FPTP tends to reward bigger parties with more seats than their vote share alone would suggest. Russian legal and media barriers protect United Russia. Mexican electoral reform made competition more genuine.

Party Discipline in the United Kingdom

The House of Commons is heavily organized by party, and the whip system keeps MPs in line. That pressure is especially important in a parliamentary system, where the executive depends on support from the legislature.

• Whips tell MPs how to vote.
• They monitor loyalty.
• They pressure members to support the party.
• Sanctions can include losing party jobs or even losing the whip.

This matters because parliamentary government depends on majority support. If the governing party cannot hold its members together, it struggles to pass laws and keep confidence.