AP U.S. Government Unit 4 Notes: Public Opinion, Events, and Party Ideology

Political ideology

A fairly stable set of beliefs about what government should do, especially regarding the size/scope of government, liberty vs. equality, and the roles of federal vs. state/local governments.

Mental shortcut (ideological heuristic)

A framework that helps people make quick decisions on complex political issues without studying every policy detail.

Liberty–security tradeoff

The tension between protecting individual freedoms and increasing government power (e.g., surveillance or law enforcement) to address safety or national security threats.

Policy feedback

The idea that government actions and policies can reshape public opinion over time by changing expectations of what government should provide and how people evaluate it.

Party coalition

A party’s supporting groups of voters and organizations with overlapping interests who work together to win elections and influence policy.

Partisan realignment

A durable, long-term change in party coalitions and patterns of party support (groups shifting toward or away from a party).

Party sorting

A trend where liberals increasingly identify as Democrats and conservatives increasingly identify as Republicans, making parties more ideologically consistent.

Political polarization

Growing ideological distance and division between the major parties (especially in government), making compromise more difficult.

Party identification

A voter’s psychological attachment to a political party; a strong predictor of voting and political attitudes but not identical to ideology.

Public opinion

The collection of attitudes and beliefs people hold about political issues, leaders, institutions, and events; affects elections, policy responsiveness, and legitimacy.

Scientific polling

Survey research designed to represent a population accurately through careful sampling and neutral question design, allowing valid inferences about the public.

Population (in polling)

The entire group a poll aims to describe (e.g., U.S. adults, registered voters, or likely voters); defining it correctly affects interpretation of results.

Sample

The subset of the population that is actually surveyed in a poll.

Representative sample

A sample that closely resembles the larger population, allowing poll results to generalize more accurately.

Random sample

A sampling method where each person in the population has an equal chance of selection, helping reduce systematic sampling bias.

Sampling bias

Systematic overrepresentation or underrepresentation of certain groups in a sample, making poll results skew away from the true population views.

Nonresponse bias

Bias that occurs when selected individuals do not respond and non-responders differ meaningfully from responders, distorting results.

Measurement error

Error caused by how survey questions are written or asked (e.g., wording, clarity, context), leading responses to misrepresent true opinions.

Leading question

A survey question written to nudge respondents toward a particular answer rather than measuring opinion neutrally.

Loaded language

Use of emotionally charged wording in a question that pushes respondents toward a certain response.

Order effects

When earlier questions influence how respondents interpret and answer later questions on a survey.

Margin of error

A statistical estimate of how much a poll’s sample result may differ from the true population value due to random sampling; it does not cover biased wording or poor sampling.

Convenience sample

A non-scientific sample made up of whoever is easiest to reach or chooses to participate (e.g., online click polls), often producing self-selection bias.

Social desirability bias

When respondents give answers they think are more socially acceptable rather than what they truly believe, especially on sensitive topics.

Push poll

A campaign tactic posing as a poll that uses leading questions to influence opinions (often by spreading negative information) rather than to measure public attitudes.