New Hampshire voters head to the polls Tuesday in one of the final primary contests of the cycle, setting up key battles for control of Congress. The most high-stakes race is the Democratic Senate primary to succeed retiring Senator Jeanne Shaheen. Representative Chris Pappas, backed by the state's Democratic establishment, faces a progressive challenge from Karishma Manzur, a medical scientist.

In the Republican Senate primary, former Senator John E. Sununu is expected to easily defeat former Senator Scott Brown. Meanwhile, the First Congressional District features a crowded Democratic field, including Stefany Shaheen, daughter of the senator, and Maura Sullivan, a former Marine.

The race tests the power of the Democratic establishment against anti-establishment fervor. On the Republican side, Anthony Di Lorenzo, endorsed by former President Trump, faces Hollie Noveletsky, an ironworks owner, in a contest that measures Trump's influence.