S. 2257 — Legislative Branch Appropriations Act, 2026

<1%becomes law moderate confidencepending: Senate on_calendar

Legislative Branch Appropriations Act — must-pass class. On the calendar, quiet for 331 days; the <1% reflects timing risk, not whether something passes.

<1%

reaches a floor vote

>99%

passes if voted (stage model)

24%

survives downstream

<1%

becomes law

The gap: on the floor this would pass — 44% by the member-vote simulation — but the floor is the hard part: <1% to ever get the vote. That gap, not the whip count, is the story.

If it reaches the floor

majority

60 (cloture)

Projected 63 yea of 100 voting; 90% interval 48–91 (quartiles 52–76). Intervals are backtest-verified to cover ~90%.

Filibusterable: the realistic Senate line is 60 votes — P(≥60) = 44% (simple-majority P = 95%).

By floor procedure

No vote is scheduled, so the headline marginalizes over how the Senate would take it up; the branches:

Procedure	Likelihood	Projected yea	Passes
conference	5%	68 [50–94]	97%
passage	95%	62 [48–90]	95%

Receipts

Sponsor: Markwayne Mullin (R). Latest action (2025-07-10): Placed on Senate Legislative Calendar under General Orders. Calendar No. 113.
Full record: Congress.gov.

Forecast run predict-20260606T193507Z · models member-vote-1.0.0-t117d118-20260606 + passage-1.0.0-t117d118-20260606 · conditional whip forecasts for the Senate run at moderate confidence (why).