Dem sweep & US-Iran ceasefire through 2027?

This market will resolve according to the combined outcome of (1) whether the Democratic Party wins control of both the United States House of Representatives and the United States Senate in the 2026 United States midterm election and (2) whether the United States refrains from a qualifying military action against Iran through the end of 2027.

Options beginning "Dem sweep" require the Democratic Party to win control of both chambers. Options beginning "No Dem sweep" require the Democratic Party not to win control of at least one of the two chambers. Each option then names the result of the second component ("Ceasefire holds" or "Ceasefire broken"), as defined below. The option matching both results will resolve to "Yes", and all other options will resolve to "No".

US-Iran ceasefire: This component is "Ceasefire broken" if the United States takes a qualifying military action against Iran between market creation and December 31, 2027, 11:59 PM Iran Standard Time. Otherwise, it is "Ceasefire holds".

A qualifying military action refers to an air strike or a surface-to-surface missile strike, initiated by the United States, that directly impacts Iran. An air strike includes bombs, air-to-surface missiles, and air-launched drones. A surface-to-surface missile strike includes one-way attack drones and surface-to-surface missiles such as cruise or ballistic missiles.

The following actions do not constitute a qualifying military action: munitions destroyed or intercepted before impact; surface-to-air missile strikes; small-arms fire; ground incursions; cyber operations; naval gunfire and artillery fire; howitzers, artillery pieces, mortars, and rocket artillery (e.g. MLRS systems); minor surface-to-surface strikes, including short range loitering munitions, FPV drones, and ATGM strikes; any threat, authorization, or announcement of force that has not been executed.

Any munition that is intercepted or destroyed before impact does not constitute a qualifying military action. Debris, fragments, or any wreckage from intercepted munitions that land on Iran do not constitute a military action regardless of any damage incurred.

“Iran” refers to the terrestrial territory of Iran, including its internal waters. Iran’s maritime territory and airspace are not encompassed. Where territorial borders are disputed, all territory claimed by and under the de facto control of Iran as of market creation will qualify.

The occurrence, attribution, and timing of a qualifying military action will be primarily determined based on a consensus of information available from the resolution sources. Where multiple sources conflict regarding the occurrence, attribution, or timing of a relevant military action, this component will remain undetermined until the earlier of: i) the confirmation of the occurrence, attribution, and timing of the action based on a consensus of information available from the resolution sources or ii) 3 full calendar days (Iran Standard Time) from the date of the first credibly reported evidence of the action. If this period would extend past December 31, 2027, this component will remain undetermined to allow for 3 full calendar days to pass. At the end of the third calendar day, if conflicting reports remain, the incident will be adjudicated based on the totality of information available from the resolution sources at that time. No single statement, denial, or presentation of evidence will govern where it is contradicted by the totality of information.

The resolution sources for this component will be official information from the governments and militaries of the United States and Iran and a consensus of credible reporting.

House and Senate control: A party wins control of the United States Senate if it wins a majority of the chamber’s voting seats. If no party wins a majority of voting seats, the party that wins control of the chamber is the party that wins half of the voting seats and holds the Vice Presidency. If the outcome remains ambiguous after applying the above criteria, the chamber will be deemed controlled by the party with which the first selected President Pro Tempore of the Congress that convenes after the 2026 midterm election is affiliated.

A party wins control of the United States House of Representatives if it wins a majority of the chamber’s voting seats. If no party wins a majority of voting seats, the chamber will be deemed controlled by the party with which the first elected Speaker of the House of the Congress that convenes after the 2026 midterm election is affiliated.

The following rules govern the counting of seats for determining which party wins control of the chambers.

For determining Senate control, all regular and special Senate elections that determine representation in the upcoming 120th Congress and are scheduled to take place in November 2026 as of October 31, 2026 are included. Vacant Senate seats for which no election or special election to fill the seat is scheduled to take place in November 2026 as of October 31, 2026 will be treated as held by the party affiliation of the most recent member to hold that seat. For determining House control, all House elections in the 2026 United States midterm election that elect voting members and determine representation in the upcoming 120th Congress are included. Where a Senate or House seat is decided by a runoff, the runoff result will determine attribution of that seat, even if it takes place after November 2026.

For seats contested in the 2026 midterm election, seats are attributed to the party under which the member was elected. If a member-elect changes party affiliation, or vacates their seat, between election day and the formal organization of Congress, the seat is attributed to the party under which the member was elected.

For seats not contested in the 2026 midterm election, seats are attributed to the party that holds the seat as of the date of the 2026 midterm election. If a current sitting member of the U.S. Senate who is not up for election changes party affiliation or vacates their seat after the date of the 2026 midterm election, the seat is attributed to the party under which the member was affiliated at the time of the 2026 midterm election.

Senate and House members elected as independents who formally caucus with, or, for newly elected members, who announce their intent to caucus with, a party are included in that party’s count. If the caucus decisions of members of the Senate or House elected as independents cannot be determined on the date of the 2026 midterm election, this component may remain undetermined until the earlier of (i) an announcement from the relevant members of their intents to caucus, or (ii) January 4th, 11:59 PM ET of the following calendar year. If no such announcement is made by January 4th, 11:59 PM ET of the following calendar year, the member will not count towards the seat count of any party.

The resolution sources for the House and Senate component will be official information from relevant state electoral authorities, the United States Congress, and a consensus of credible reporting.