NH Senate showdown set: New Hampshire voters picked former Sen. John Sununu (R) and Rep. Chris Pappas (D) to face off in the open U.S. Senate seat after Tuesday’s primaries, a contest Democrats see as key to retaking the chamber and Republicans see as a rare pickup chance in a purple state. Local politics with national stakes: The same night, Stefany Shaheen won the Democratic nod for NH-01, while Anthony DiLorenzo took the GOP primary—setting up another high-profile fall race. Trade war pressure: The U.S. escalated its fight with Canada by banning certain Canadian dairy, most alcohol, and some motorcycles starting Sept. 29, after Canada’s retaliatory tariffs hit $20 billion in U.S. imports—raising fresh concerns for prices and supply chains. Business/tech governance: Insygna named WorkTech founder George LaRocque to its advisory board as companies push to manage and govern AI agents like other enterprise workforces. Consumer/real economy: VIVE Collision expanded in the Northeast by acquiring Jasmin Auto Body, adding to its multi-site footprint. Legal/markets: Planet Fitness faces a securities-fraud class action tied to concerns about membership growth. Community note: Dover will unveil its permanent 9/11 memorial on Sept. 11.