Model Parameters

Live Engine

Scenario Presets

Top of Ticket (Pres. Baseline)

Presidential Dem vs Rep Margin D +9.1%

Net margin statewide (+ is Dem, - is Rep). District 1 leans D+8.5, District 2 leans R+8.5.

Down-Ballot Incumbent Advantage

Incumbent Crossover Pull 14.5%

Percent of opposing presidential voters crossing over for the down-ballot incumbent.

Partisan Loyalty Floor 88.0%

Incumbent's retention among their own presidential party base.

Third-Party / Independent Share 5.0%

Voters choosing an independent or green challenger in Round 1.

Ranked-Choice Voting (RCV) Rules

Enable Maine RCV Instant Runoff

Ind. 2nd Choice to Dem vs Rep 62% to Dem

Allocation of eliminated minor candidate ballots in Round 2.

Simulated Election Outcome

Simulated: Active

Senate Incumbent Margin R +8.6% 51.1% vs 42.5%

Ticket-Split Gap +17.7 pts Outperformed Pres ticket

RCV Runoff Needed? No (51.1%) Clear >50% plurality

Cross-Pressured Voters ~104,200 Biden-Collins splitters

Statewide Senate Vote Share Total Estimated Turnout: 820,000 ballots

Dem Challenger: 42.5% Ind / Third: 5.0% Rep Incumbent: 51.1%

42.5%

51.1%

Sub-Region & Congressional District Breakdown Maine CD-1 (Southern Coast) vs CD-2 (Rural/North)

Jurisdiction	Pres Dem	Pres Rep	Senate Dem	Senate Rep	Ticket Divergence	Outcome

Ranked Choice Voting (RCV) Flow Analysis Automatic runoff triggered if no candidate achieves >50.0% in Round 1

Round 1: First Choice Plurality

Round 2: Exhaustion & Redistribution

Model calibrated with Maine dual-district electoral geography.

Understanding Electoral Ticket-Splitting & Coattail Dynamics

In an era characterized by record-high straight-ticket voting and intense national polarization, down-ballot candidates who reliably outperform their party’s presidential baseline are exceedingly rare. The dynamics highlighted by Sen. Susan Collins nudging presidential nominees to keep distance from state campaigns reflect a structural political reality: in swing or split-electoral states, top-of-the-ticket figures can act as an anchor or a lightning rod.

This model formalizes four distinct mechanisms that dictate down-ballot survival under partisan cross-pressures:

Crossover Elasticity: The willingness of moderate or independent-leaning partisans to decouple their vote. In Maine’s 2020 election, Sen. Collins secured roughly 14% to 16% of voters who simultaneously cast ballots for Joe Biden, generating a net 17.7-point spread between the presidential outcome (Biden +9.1) and the Senate outcome (Collins +8.6).
Geographic Disaggregation (ME-1 vs ME-2): Maine awards two electoral votes to the statewide winner and one to each congressional district. A candidate can balance an overwhelming deficit in urban/suburban districts (CD-1) by dominating rural, working-class areas (CD-2) where personal constituent brand shields them from national backlash.
Ranked-Choice Transfers (RCV): Under Maine’s Ranked Choice Voting statutes (21-A M.R.S. § 723-A), if no candidate breaches 50% plus one vote on the first ballot, the lowest-polling candidate is eliminated and their second preferences redistributed. This prevents minor-party spoiler effects from denying a consensus candidate a final majority.
National Polarization Friction: As national media saturates local races, the "coattail drag" coefficient rises, suppressing crossover voting toward single digits.

Electoral Analysis FAQ

Why do incumbents ask presidential nominees to stay away?

Presidential rallies nationalize down-ballot races, activating straight-ticket partisan identities and shrinking the pool of persuadable crossover voters necessary to win in unfavorable territory.

How does Ranked-Choice Voting impact ticket-splitters?

RCV allows disaffected voters to express dissatisfaction with major parties in Round 1 without wasting their vote, transferring support to their preferred major candidate in subsequent rounds.

Can a candidate win without winning both congressional districts?

Yes; in a two-district state like Maine, winning statewide requires either winning both districts or building an insurmountable margin in one district that exceeds the deficit in the other.

What causes the ticket-splitting gap to shrink over time?

Increased media nationalization, straight-ticket digital fundraising, and geographic partisan sorting decrease split-ticket voting from historical peaks of 25%+ in the 1980s to under 5% in modern presidential cycles.