(NewsNation) — On one of the biggest days of the year for primaries across the United States, Iowa is holding a number of important elections.

In one of them, a Republican state senator has captured the slot to take on Democratic Rep. Cindy Axne this fall in a newly drawn district that appears more favorable for the GOP.

Axne is the only Democrat in Iowa’s House delegation.

State Sen. Zach Nunn easily outdistanced rivals Nicole Hasso, a financial services worker, and Gary Leffler, who works in the construction industry, to claim the GOP spot. Nunn, an Air Force pilot who has served in the Legislature since 2014 and has worked to cut taxes, was the best known among the GOP contenders.

In previous elections, Axne was elevated by her strong support in the Des Moines area, even as she struggled in rural counties that typically lean Republican. The new district includes several counties in southern Iowa known to turn out strongly for Republicans, increasing the pressure on Axne to drive up her numbers in Democrat-friendly Des Moines and its suburbs.

Republican National Committee Chairwoman Ronna McDaniel promised that Iowa would “send the first congressional delegation to Washington that’s fully Republican since 1957.”

You can switch between races by selecting the race you wish to see in the drop-down menu labeled “Change Race” in the top right corner of each of the modules below. And you can see results by county with the drop-down menu labeled “County Results.”