DES MOINES, Iowa (AP) — Iowa Democrats on Tuesday will settle one of the party's last competitive U.S. Senate primaries, choosing between two state lawmakers who each say he is better poised to flip a retiring Republican's seat.

LIVE RESULTS: Iowa midterm primaries

Either Josh Turek or Zach Wahls will go up against a full-throttled Republican defense of two-term Sen. Joni Ernst's seat, which the GOP considers pivotal to keeping its Senate majority. It's one of many competitive races in Iowa attracting national interest, including from the White House. President Donald Trump and Vice President JD Vance have both touched down in the state this year to shore up Republican enthusiasm.

U.S. Rep. Ashley Hinson is seeking the GOP nomination and has the backing of Trump and Ernst. She is running against former state Sen. Jim Carlin.

Democrats feel hopeful that high prices, lost manufacturing jobs, shuttered healthcare facilities and a struggling agricultural economy will help the party dismantle the all-GOP federal delegation and Republican statehouse trifecta. Leading the ticket is State Auditor Rob Sand, the candidate for governor and the lone Democrat currently holding statewide office. Sand, who is unopposed in the Democratic primary, has been able to hone his moderate message, remind voters of his rural upbringing and amass an $18 million campaign fund.