Turek, a state representative and Paralympic gold medalist, beat state Sen. Zach Wahls, NBC News projects, as Democrats try to compete for retiring U.S. Sen. Joni Ernst's seat this fall.
Democratic senators express confidence in Maine Senate candidate Graham Platner despite alleged sexting scandals and resurfaced online posts controversies.
Eric Swalwell was one of the leading contenders, but when he dropped out amid sexual assault allegations, his Democratic rivals saw a chance to win more voters.
Mr. Platner, the likely Democratic nominee for Senate in Maine, met in Washington with several senators. Chuck Schumer, the minority leader, dodged questions about his confidence in Mr. Platner.
Proposition 50 has created a handful of key races where Democrats will choose candidates to pit against vulnerable Republican incumbents. Generational challenges have infused other contests.