How Rivals Create "Tunnels of Attention" in Party Campaigns

📌 The Puzzle

Dominant visions of representative democracy assume parties focus on contrasting issues during campaigns, producing a diverse political supply. However, empirical backing for that claim is scarce. Parties face weak incentives to leave potentially rewarding issues to rivals, and uncertainty about electorate preferences drives strategic monitoring of competitors.

🔍 The Argument

The logic proposed is straightforward: lacking precise knowledge of short-term voter preferences, parties watch rivals and adopt issues highlighted by opponents rather than ceding them. This dynamic produces patterned imitation across topics, creating what is called "tunnels of attention"—clusters of issues emphasized in tandem because parties follow one another.

📊 Data: Seven Democracies, Four Decades, All Issues

• A unique dataset covering all policy issues across seven diverse advanced democracies over four decades.
• Empirical analyses track issue emphasis by parties across time and issues to detect competitive imitation.

🔑 Key Findings

• Issue attention is primarily driven by rivals' emphases rather than independent issue choices.
• Observed patterns form "tunnels of attention": parties converge on the same sets of issues because they copy competitors.
• Introducing the alternative explanation—responsiveness to voters—does not overturn the main result; the model still holds, supporting the conclusion that tunnels are endogenous to inter-party competition.

🧪 Robustness and Inference

• Results remain consistent when accounting for voter responsiveness, indicating that mimicry among parties is not just a passive reflection of public demand but an active competitive dynamic.

💡 Why It Matters

This reconceptualization of issue attention challenges assumptions about programmatic diversity in modern democracies. If parties repeatedly import issues from rivals, then representation, agenda diversity, and theories of party competition require reevaluation: party supply may be more constrained and interdependent than previously thought.