Who can vote and who votes
The right to vote and the act of voting are separate political questions. Constitutional amendments and federal laws can remove formal barriers, but turnout still depends on registration rules, election administration, mobilization, political interest, education, age, competitiveness, and the kind of election being held. A legal right creates access; it does not guarantee participation. On exam questions, first identify whether the issue concerns legal eligibility or actual participation.
Voting rights and voting behavior are different problems
Voting rights describe who is legally eligible to vote and what barriers government may not impose on that eligibility. Voting behavior describes what eligible citizens do: whether they register, whether they turn out, and how they choose among candidates. A country can expand voting rights substantially while turnout among newly eligible voters remains low, because legal access and the decision to participate are governed by different factors.
How the franchise expanded
- Fourteenth Amendment: granted citizenship to persons born or naturalized in the United States, including formerly enslaved people, and supplied Due Process and Equal Protection protections later central to voting-rights litigation.
- Fifteenth Amendment: barred denying the vote based on race, color, or previous condition of servitude, though enforcement was resisted for decades.
- Seventeenth Amendment: changed selection of U.S. senators from state legislatures to direct election by voters.
- Nineteenth Amendment: prohibited denial or abridgment of voting rights on account of sex.
- Twenty-Fourth Amendment: barred poll taxes in federal elections, removing a financial barrier that had suppressed turnout among lower-income voters.
- Twenty-Sixth Amendment: lowered the voting age to eighteen.
- Voting Rights Act of 1965: prohibits racial discrimination in voting and provides federal statutory tools to protect voting rights.
Each of these removed a specific formal barrier or changed a specific selection method. None of them, by itself, guaranteed that everyone newly eligible would vote.
Models of voting behavior
Political scientists describe several models of how voters decide. Rational-choice voting occurs when individuals base a vote on what they perceive to be in their own best interest. Retrospective voting evaluates an incumbent's past performance in office. Prospective voting evaluates a candidate's expected future performance based on stated positions and promises. Straight-ticket voting means selecting all candidates from one political party on the ballot, relying heavily on partisan identification rather than a candidate-specific evaluation. Confusing retrospective with prospective voting is a common and specific error: retrospective voting looks backward at what has already happened, not forward at a candidate's plans.
| Voting model | What it evaluates |
|---|---|
| Rational-choice voting | What the voter perceives to be in their own best interest |
| Retrospective voting | An incumbent's past performance in office |
| Prospective voting | A candidate's expected future performance based on stated positions |
| Straight-ticket voting | Selecting all candidates from one party, relying on partisan identification |
Why eligible voters do not all turn out
Low turnout is not caused by voter apathy alone. Registration deadlines and requirements, the competitiveness of a race, mobilization efforts by parties and campaigns, the type of election, and individual factors such as education and age all interact. According to the U.S. Census Bureau, 73.6% of the citizen voting-age population was registered and 65.3% voted in the 2024 presidential election, figures that varied substantially across demographic groups and cannot be reduced to a single cause.
State election rules can also change the cost of voting. Polling hours, voter-identification requirements, funding for polling places and workers, registration procedures, and the availability of mail, absentee, or early voting can make participation easier or harder for different voters.
Political efficacy is the belief that a person's participation can make a difference in politics. Higher efficacy can make voting feel consequential; lower efficacy can discourage participation even when legal access is available. Use efficacy as a turnout explanation only when the scenario or evidence supports it. A turnout percentage by itself does not establish why people voted or stayed home.
Read turnout data without inventing a cause
A turnout figure describes an outcome; it does not by itself explain why that outcome occurred. A precise reading states the population and denominator the figure describes, since turnout can be reported as a share of the voting-age population or the narrower citizen voting-age population, and these produce different numbers. Attaching a single cause to a turnout figure without evidence for that mechanism overstates what the data can support.
Worked scenarios: identify the voting model
Scenario 1. A voter supports the incumbent because unemployment fell during that official's term. Retrospective voting, evaluating past performance.
Scenario 2. A voter supports a challenger who has proposed a specific new infrastructure plan the voter finds promising. Prospective voting, evaluating expected future performance.
Scenario 3. A voter selects candidates from the same party in every race, largely without researching each individual candidate. Straight-ticket voting, relying on partisan identification.
Scenario 4. A voter chooses the candidate whose proposed tax policy would most directly benefit the voter's own household. Rational-choice voting, based on the voter's perceived best interest.
Exam habits
- Ask first: is this about who may vote (rights) or who does vote (behavior)?
- For voting models, ask which direction in time the voter is looking, and whether the voter is following party or personal benefit.
- For turnout, name the denominator and avoid a single-cause explanation.
- Use "party-line voting" only descriptively; the term to retrieve is straight-ticket voting.