28.7% of House roll calls were decided by five votes or fewer (119th Congress, 2nd session)
90 of 314 recorded roll calls came down to a margin of five or fewer. Most are procedural motions on rules, which a narrowly divided chamber decides the same way each time, so this tracks the working majority's size, not drama. Civic Forecast calculation from Office of the Clerk roll-call records for the session; the denominator is every roll call, including the quorum call.
Induced by API Automations for Civic Forecast from federal open data. Each finding names the datasets it was computed from. How this is calculated.