How many Senate Democrats will lose their primary in 2026?

Before Nov 3, 2026 If the number of Democratic Senate members that lose their primary in 2026 before Nov 03, 2026 is exactly X then the market resolves to Yes. To be included, candidates must: be running in an election for the office they currently hold, regardless of District, for a party they are currently in, as of primary day for the seat they're contesting in in 2026; be running for the nomination of a position whose election day is on the same date as most Congressional elections in 2026,