Voter File Management for Campaign Canvassing: A Practical Guide

Voter data decides which doors your canvassers knock on and which they skip. The voter file determines who you contact, what you say, and how you measure success. Yet many campaigns give it little attention, loading the data once at the start and never updating it. As a result, canvassers visit wrong addresses, contact the wrong voters, and collect unreliable data.

This guide explains how to manage your voter file for effective canvassing.

Understanding Your Voter File

What's in a Voter File?

A voter file is a database of the registered voters in your area. Standard fields include:

• Personal information: Name, address, date of birth, phone number (when available), email (when available)
• Registration data: Party registration, registration date, registration status (active, inactive)
• Vote history. Which elections the voter took part in (not how they voted, which is protected by the secret ballot)
• District information: Congressional district, state legislative districts, county, city, precinct, ward

Where to Get Voter Files

Voter file sources vary by state:

• State party committees. Both major parties keep expanded voter files with modeling scores (statistical estimates of voter behavior) and records of past contact. These are usually the most useful for campaigns.
• State election offices. Basic voter files are available from the Secretary of State or county election offices, usually for a small fee. These contain registration and vote history data.
• Data vendors: Companies such as L2, TargetSmart, and others sell expanded voter files with added information, such as phone numbers, emails, consumer data, and predictive models.

Targeting: Choosing Which Voters to Contact

You cannot canvass every registered voter, so targeting decides who appears on your walk lists (each canvasser's list of addresses to visit):

Partisan Targeting

In states with party registration, start by identifying persuadable voters, meaning those registered as independent or third-party, or with the opposing party but with a history of split-ticket voting (voting for candidates of more than one party). Do not spend canvassing time on strong supporters of the other side.

For the wider picture, read how campaign field programs are built.

Vote History Targeting

Voters who vote in every election do not need GOTV (get-out-the-vote) reminders, and voters who never vote are unlikely to start because you knocked on their door. Focus on the voters in between, who vote only sometimes, such as in presidential years but not midterms, or in general elections but not primaries. Your canvassing is most likely to change what these voters do.

Modeling Scores

Many voter files now include predictive scores: a support score (likelihood of supporting your candidate), a turnout score (likelihood of voting), and a persuasion score (likelihood of being persuaded). Use these to decide whom to contact first. For persuasion canvassing, focus on voters with high persuasion scores, and for GOTV, focus on voters with medium turnout scores.

Geographic Targeting

Give priority to precincts where small changes in turnout or persuasion can change the result. A precinct your candidate lost by 50 points last time is not worth canvassing, but a precinct lost by 5 points is a strong target.

Keeping Your File Accurate

Address Verification

Voter files contain errors, because people move, addresses are entered incorrectly, and apartment numbers go missing. Before loading data into your canvassing app, run address verification to:

• Standardize address formats
• Flag addresses that don't match postal records
• Identify duplicate records
• Add missing apartment or unit numbers

Remove Ineligible Records

Remove voters who should not be on your canvassing lists:

• Inactive registrations (in most states, these voters have been marked as having possibly moved)
• Deceased voters (check against NCOA, the Postal Service's change-of-address records, and death records)
• Voters outside your district
• Voters at addresses marked as vacant by USPS

Ongoing Maintenance

Your voter file needs regular updates, including:

• Canvassing results (the information your canvassers collect at the door)
• Updated voter registration data from the state (especially important as registration deadlines approach)
• Early voting and absentee ballot data during GOTV
• Do-not-contact requests from voters in the field

Loading Data into Your Canvassing Platform

When importing voter data into Beacon or any canvassing app, follow these practices:

• Match fields carefully. Make sure each voter file field goes into the correct field in the app. Mismatched fields scramble your data.
• Test with a small batch. Load a sample of 100 to 200 records first. Check that they display correctly, that addresses appear in the right place on the map, and that all fields are filled in.
• Include all relevant fields. Load more than name and address. Include party registration, vote history, and any targeting scores, because canvassers make better decisions when they have background on each voter.
• Set up survey questions: Set up the fields your canvassers will fill in, such as the voter ID rating (how strongly the voter supports your candidate), issue responses, follow-up needs, and any custom questions.

Using Canvassing Data to Improve Your File

Every door your canvassers knock on produces information that improves your voter file:

• Voter ID data. Direct support ratings from conversations are more accurate than any predictive model
• Address corrections: Canvassers find wrong addresses, voters who have moved, and properties that have changed use (a house turned into a business) that no database shows
• Contact information updates. Collecting phone numbers and emails at the door adds to your file for future outreach
• Voter concerns. What voters tell canvassers about their concerns helps shape the campaign's message for the rest of the race

This information goes back into your voter file, so each later round of canvassing is better targeted and more effective. Beacon uploads canvassing results as they are recorded, so they are available right away for analysis and list updates instead of waiting on a clipboard to be entered.

Security and Compliance

Voter data comes with responsibilities:

• Secure storage. Voter files contain personal information. Store them securely, limit access to people who need it, and do not email files that are not encrypted.
• Use restrictions. Most states restrict voter file use to political purposes. Do not use voter data for commercial sales or marketing.
• Do-not-contact requests. When a voter asks not to be contacted, honor that request immediately and permanently. Update your file and your canvassing lists.
• Data retention. After the campaign, follow your state party's guidelines for retaining or returning voter data.

When a voter file is managed well, canvassers knock on the right doors, have the information they need, and collect data that improves the whole campaign over time. It is routine work, but everything else in your canvassing depends on it.