Senate Swing-State Map Markets: What “None” Actually Means

The busiest election board on Polymarket heading into Election Day is not “who wins the Senate.” It is a map. Which Senate swing states will Republicans win? pays only if the Republican nominee wins an exact set of seven states: Alaska, Iowa, Kansas, Maine, Michigan, Ohio, and Texas.

“None” on that board means Republicans win none of those seven. It does not mean Republicans win no Senate seats in the country. Safe seats outside the list never touch the map. That single distinction is why a map price and a chamber-control price can move in different directions on the same night.

Election Day is November 3. The map does not settle at 6 p.m.

U.S. Election Day in 2026 is Tuesday, November 3. Bloomberg notes that the first polls close at 6 p.m. Eastern. A call on television is not, by itself, the settlement event for this contract.

The rule summarized by pdata says the market resolves according to which of those seven Senate elections the Republican candidate wins, including any runoff. A listed outcome pays only when Republicans win every state it names and none of the other six. If another candidate wins a state, including a Democrat, independent, or third-party candidate, that state is not a Republican win. An independent is not treated as a Republican because of a past party tie.

The named sources are the Associated Press, Fox News, and NBC. The market waits until all three have called the covered races. If they do not agree, resolution falls to official certification. A state whose result still cannot be determined counts as not won by the Republican, and the cutoff in the published rule runs to March 31, 2027. Election night can reprice the map long before it pays.

128 outcomes, because seven states make 128 maps

Each state has two relevant results for this question: the Republican nominee wins, or the Republican nominee does not. Seven states produce 2 × 2 × 2 × 2 × 2 × 2 × 2 = 128 exact maps. “None” is the empty set. “All 7” is the full set. “IA” means Iowa and only Iowa. “IA, KS” means those two and not the other five.

Only one of the 128 can be right. That is different from a ladder of nested thresholds, where “above 15” and “above 20” can both pay. Buying two map outcomes is buying two mutually exclusive stories. If your read is “Republicans win Iowa, and maybe Kansas,” those are two contracts, not one flexible contract.

At 03:14 UTC on November 2, pdata recorded “None” at 35 cents, Iowa alone at 10, and Iowa plus Kansas at 9, across 128 outcomes, with about $8.9 million of Polymarket-reported volume in the prior 24 hours. That is a timestamped illustration. The board was already moving: “None” was up 9 points over that window. Do not treat any of those cents as the price available now, or as a forecast from Polypick.

Chamber control is a second question

Senate control asks whether one caucus reaches a majority after every seat is counted, including the seats that were not on the 2026 ballot. House control asks the same kind of question across 435 districts. A balance-of-power contract then combines the two chambers.

Kalshi reported on November 1 that its Congress balance-of-power contract priced a Democratic sweep at 70 percent, a Democratic House with a Republican Senate at 27 percent, and a Republican sweep at 6 percent. Those are chamber outcomes. They do not identify Alaska, Iowa, or Texas. A Democratic sweep can happen with more than one Republican win inside the seven-state map, and “None” on the map can happen without Democrats winning the Senate. The October chamber snapshot is in the one-month-out midterm note. This post is about the map product that has since taken over the volume ranking.

Polls are a third object again. A poll estimates a sample of voters. A contract prices a written outcome. The comparison is in prediction markets versus polls.

What can make the map and the headline disagree

• A state outside the seven. Florida, Nebraska, or any other Senate race can decide control and leave this map unchanged.
• An independent or a runoff. The rule counts the eventual Republican nominee’s win, including a later runoff, and it does not recode an independent as a Republican.
• A split among the three news sources. One network’s call is not enough if the contract requires all three, and certification is the fallback.
• Ohio’s special election. The rule includes Ohio as a special election inside the seven. It is not a generic “toss-up” label you can swap for a different state.

For the general difference between a news call and a payout, see how prediction markets resolve.

How to read the price before you treat it as a probability

In a complete, mutually exclusive board, the probabilities of the 128 maps should add to about 100 percent. Live screens often do not. Each outcome has its own bid and ask, thin outcomes go stale, and a displayed leader can be a midpoint rather than the price you can buy. Add the asks on “None” and “All 7” and you have not found two complementary halves of one contract.

A practical read is: name the exact set, check that every other covered state is excluded, then look at the ask for that one outcome. “Republicans do well in the Senate” is not an order.

Frequently asked questions

What does None mean on a Senate swing-state map? On this Polymarket, None means the Republican nominee wins none of Alaska, Iowa, Kansas, Maine, Michigan, Ohio, and Texas. It does not mean Republicans win no Senate seats anywhere.

Why does the map have 128 outcomes? Each of the seven states can go one of two ways for this question. Seven binary results create 128 exact combinations, and only one can be correct.

Is a map market the same as Senate control? No. Senate control counts every seat, including seats not on the ballot. The map ignores every state outside its list.

When does the 2026 Senate map market resolve? Election Day is November 3, 2026, but the cited rule waits for the Associated Press, Fox News, and NBC to call every covered race. If they disagree, it uses official certification. Runoffs count, and an undetermined race can remain open until March 31, 2027.

Sources and methodology

Map rules, the seven-state list, the 128-outcome count, and the November 2, 03:14 UTC prices were taken from pdata’s page for the Polymarket event and the Polymarket event. The balance-of-power snapshot is from Kalshi’s November 1 report. Poll-closing timing is from Bloomberg’s Senate results page. Prices move. The live rule and order book control any trade.