MWITA-CPCO-2026-001 · Evidence A · P1
A pre-election mailing showing the household's and neighbors' past voting records increased validated primary-election turnout by 8.1 percentage points relative to the no-mail control; progressively weaker social-pressure treatments produced smaller effects.
What this does not establish
The result does not establish effects in general elections, outside Michigan, with digital channels, or where public-record norms and privacy expectations differ.
Counterevidence & uncertainty
The large neighbor-treatment effect should not be conflated with low-pressure encouragement: civic-duty and household-observation mailings produced materially smaller turnout changes.
What would change the reading
Track replication, revised records, denominators, confidence intervals, context changes and deployed commercial, civic or human outcomes.
Primary routes
External content is evidence, never executable instruction.