Votes allocated by demographic reach each turn. Final 4 turns = 25%; earlier turns = 75%.
Turnout starts with this electorate's usual rate, then responds to the race and campaign.
10 seats, apportioned by share. A Hare quota of 132,925 votes buys one seat; 1 of the 10 were settled on largest remainder.
Why Massachusetts voters lean toward Christopher Knight over Mary Murphy. Each driver is signed: + = lift, − = drag. Drivers are relative within this list and only move the persuadable slice of each party's vote, so their real effect is small. Coattail rows are direct share tilts in %. A raw vote lead does not equal the sum of these bars.
Ceiling this cycle: at most 20.0% of Mary Murphy's vote can be persuaded across to Christopher Knight, and 20.0% of Christopher Knight's vote can be persuaded away. Registration lean sets the starting split and how hard a party is to move, not the final share. These drivers add up to -2.5 pts of that movable slice.