Voter Mobilisation and Turnout

If persuasion is the part of campaigning that promises the most and delivers the least, mobilisation is the opposite. Getting a supporter who might stay home to cast a ballot is a modest goal, and it is one that campaigns can measure. For more than two decades, researchers have run large experiments in which some voters receive a knock on the door, a phone call, a letter or a text and others do not, and then checked the official records to see who voted. The result is one of the best-evidenced bodies of knowledge in politics, and it comes with prices attached.

The toolkit has changed since 2024. Text messages became the default contact, then became so common that their effect wore thin. Campaigns turned to relational organising, asking volunteers to mobilise their own friends. Candidates spent hours with podcasters and streamers. In much of the world, closed messaging apps such as WhatsApp became the place where campaigns organise. In Europe, the loss of paid political advertising on the biggest platforms forced parties to rebuild their field operations. And AI voices arrived on the phones, prompting new rules about robocalls.

Why this matters to you

If you run a field operation, this chapter helps you spend a limited budget where it buys the most turnout. It prices the main contact types and shows why the cheapest contact per person can be the most expensive per vote. It warns that effects fade when a tactic is repeated or scaled, and that some fashionable tactics have little evidence behind them. If you fund campaigns or advise them, it helps you ask the right question of any new channel: has anyone measured what it does to turnout, using real voting records? And if you care about who votes, it covers the evidence on young voters and on how turnout spreads through households.

What you'll find inside

The chapter opens by pricing contact: what a door knock, a call, a letter or a text is worth in extra votes, and what it costs. It then follows text messages from novelty to noise, and tests relational organising, where friends beat strangers but the evidence is harder to gather than the enthusiasm. You will see what creators and podcasts did in 2024, and what the evidence says closed messaging apps change. One piece follows European parties campaigning without paid social media. Others ask whether early and mail voting bring in new voters or move existing ones earlier, how AI voices and robocall rules are changing phone contact, and how small-dollar fundraising works as a system designed to raise more. The chapter closes with youth turnout in 2024 and with the finding that turnout is contagious: contacting one voter can move others in the same household.

The honest note

The characteristic caveat of this chapter is a trade-off that keeps recurring. The effects that replicate tend to be personal, expensive and hard to scale: a conversation with someone you know or a volunteer at the door. The tactics that scale easily, such as mass texts and automated calls, mostly show small effects or none that anyone has reliably measured. Much of the newest material, especially on creators, messaging apps and relational organising, rests on practitioner reports and early studies rather than large experiments, and the articles say so. Treat a confident claim about a new channel as a hypothesis until someone has checked it against the voting record.

The eleven pieces in this chapter

• P5-01 · What a Contact Is Worth: GOTV effects by mode, priced
• P5-02 · Text Message Decay: From novelty to noise
• P5-03 · Relational Organising: Friends beat strangers
• P5-04 · Creators as Campaign Media: Podcasts, streamers and the 2024 shift
• P5-05 · The WhatsApp Election: Closed channels as campaign infrastructure
• P5-06 · Campaigning Without Paid Social: The EU experiment
• P5-07 · Banking the Vote: Early and mail voting as a field strategy
• P5-08 · Machines on the Phones: AI voice, robocall bans and the volunteer
• P5-09 · Small-Dollar Data: Fundraising as a behavioural system
• P5-10 · Turning Out the Young: What worked in 2024, what didn't
• P5-11 · Turnout Is Contagious: The household you didn't text