Seats projected by demographic reach and regional support each turn.
55 seats, apportioned by share. A Hare quota of 55,487 votes buys one seat; 3 of the 55 were settled on largest remainder.
Why IT_SIC voters lean toward Andrea Costa over Tommaso Gentile. 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 Tommaso Gentile's vote can be persuaded across to Andrea Costa, and 20.0% of Andrea Costa'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 0.3 pts of that movable slice.