Political Ideologies & Voter Behavior
Cleavage theory, realignment, turnout, and the ideology maps that explain modern voting.
Ideologies
The political compass
The classic left-right axis (economic) is often paired with a second authoritarian-libertarian axis (social). Mapping parties on both reveals coalitions not visible on a single line.
Economic left
Social democracy, democratic socialism, labor parties. Redistribution, unions, public services. E.g., UK Labour, German SPD.
Economic right
Free markets, low taxation, limited state. E.g., UK Conservatives (pre-2016), US Republicans on economic policy.
Authoritarian
Strong state, national culture, law and order. E.g., Hungary's Fidesz, Turkey's AKP.
Libertarian
Individual rights, small state, civil liberties. E.g., US Libertarian Party, parts of German FDP.
Modern ideological families
Key Points
- Social democracy: market + generous welfare + rights (Scandinavia).
- Christian democracy: center-right parties rooted in Catholic social teaching (CDU).
- National conservatism: traditional values + economic interventionism (Fidesz, parts of GOP).
- Green: ecological politics + often social-liberal positions.
- Progressive / Democratic socialist: redistribution + racial and gender equity (The Squad, Die Linke).
Voter Behavior
Cleavage theory
Lipset & Rokkan (1967) identified four social cleavages that structured 20th-century European politics: owner-worker, church-state, center-periphery, urban-rural. Most modern realignment arguments invoke cleavages — education (diploma divide) being the newest.
Key Points
- Diploma divide: college-educated voters in rich democracies shifted left post-2016; non-college voters shifted right.
- Gender gap: young women have moved significantly left; young men have partially moved right. Biggest swing in decades.
- Geography: 'density effect' — every rich democracy is seeing cities trend left and rural areas trend right.
Do voters vote rationally?
Retrospective voting
Voters reward or punish incumbents based on recent performance (economy, crime). Fiorina (1981) remains the canonical text.
Identity voting
Party ID as social identity — Achen & Bartels' 'Democracy for Realists' (2016) argues most voters choose parties first, positions second.
Issue voting
Voters who select a party based on specific policy positions — least common but most normatively privileged.
Who votes?
Key Points
- Older voters, higher-income voters, and college-educated voters turn out at dramatically higher rates — in every democracy studied.
- Compulsory voting eliminates most demographic turnout gaps.
- 'Mobilization gap': parties invest unevenly in turning out different demographics.
Realignment
US realignments
Political scientists identify five US realignments (1800, 1828, 1860, 1896, 1932) and debate a sixth (post-1968 or post-2008). Each permanently shifted which coalitions voted Democratic vs Republican.
Key Points
- 1932 (New Deal): FDR built the Democratic coalition of unions + Black northern voters + South.
- 1968 (Southern Strategy): Nixon flipped the white South Republican.
- 2016-present: Education realignment — non-college white voters → GOP, college-educated whites → Dems.
Global realignment
Piketty's 'Brahmin Left' thesis argues every rich democracy has seen left parties lose working-class voters and gain educated ones. True in UK (Brexit), France (Macron vs Le Pen), Germany (AfD rise).
FAQ
How many swing voters are there?
Probably 5-10% in US presidential elections. Most 'independents' are lean-partisans. True swing voters are disproportionately low-information and less ideological — a persuasion target, not a debate target.
Will young voters stay left as they age?
Past cohorts softened somewhat as they aged but rarely flipped. Current Gen Z is more polarized by gender than any prior cohort (Financial Times, 2024) — predictions about future behavior should be cautious.
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