# US state primary elections > Live situation record from CLSTR: https://clstr.news/situations/us-state-primary-elections > Updated: 2026-09-14T12:35:24.000Z. Sources: 9. Developments: 2. In September 2026, several U.S. states conducted primary elections for various legislative and statewide offices. In New Hampshire, voters participated in primaries for key Senate and House seats. In the Republican primary for the Senate seat being vacated by retiring Senator Jeanne Shaheen, former Senator John Sununu emerged as a prominent candidate. In the Democratic primary for the same seat, Representative Chris Pappas led the field against challenger Karishma Manzur. Local contests also saw Republican victories in the Upper Valley and the Executive Council District 2 primary. In Delaware, state primary elections were held for Senate and House seats. The Democratic primary for U.S. Senator featured incumbent Chris Coons facing challengers Jeff Appelhans, Mary Louve, and E. No-Trump Hansen. In the Republican primary for the same office, Michael Katz and John Shulli competed for the nomination. Other notable Delaware contests included the race for State Attorney General and an open race for State Treasurer. ## Timeline ### 2026-09-14: Delaware holds state primary elections for Senate and House seats Delaware holds its state primary election on Tuesday, featuring key races for U.S. Senate, U.S. House, and State Attorney General to set the stage for the November general election. 4 sources. https://clstr.news/cluster/delaware-holds-state-primary-elections-for-senate-and-house-seats ### 2026-09-08: New Hampshire holds primary elections for key Senate and House seats New Hampshire held primary elections for several key offices, including a competitive Senate race and various House and Executive Council seats. 5 sources. https://clstr.news/cluster/new-hampshire-holds-primary-elections-for-key-senate-and-house-seats --- Cite as: US state primary elections. CLSTR, https://clstr.news/situations/us-state-primary-elections