Finding 2 — The midterm amplifier

Presidential vs midterm: turnout by cohort

The amplifier effect

Senior turnout is stable; youth turnout is volatile

Youth turnout varies from roughly 19% (midterm low) to 52% (presidential high) across the series — a 33-point range depending on what's on the ballot. Senior turnout varies only from 68% to 76% — an 8-point range. Youth participation is highly responsive to election salience; senior participation is mostly not.

What this page establishes

1. Midterm youth turnout is consistently 15-20 points below presidential youth turnout. Not a single exception in the dataset.
2. Senior turnout moves less than 10 points across the same range of cycles. Habit-formed participation is stable.
3. The amplifier is a youth-mobilization failure, not a senior-surge phenomenon. Interventions that only activate during presidential cycles leave the midterm gap intact.

So what

For Secretaries of State. The midterm electorate is substantially less representative of the citizen voting-age population than the presidential electorate. Youth voices reach policy primarily through cycles where the presidency is contested.

For foundation officers. Cyclical GOTV that concentrates on presidential years misses where the gap is largest. Interventions with multi-cycle effects — policy reform, pre-registration, administrative improvements — do not collapse between cycles, and the midterm amplifier is where they show their value. See Recommendations.

For the public. When the presidency isn't on the ballot, one in four Americans 65+ vote for every one American 18-29 who does. Policy that flows from midterm electorates can reflect that imbalance.