Republicans are all but guaranteed to maintain control of the Iowa Senate after November and could expand their majority, now at 29 out of 50 seats. However, Democrats have a chance to pick up a few districts as they work toward winning back the chamber in 2020.

A record number of women running for office in Iowa this year has translated into a record number of women who will appear on our state’s general election ballot. Iowa State University’s Carrie Chapman Catt Center for Women and Politics noted that 85 women (86 percent of female candidates on Iowa’s primary ballot) won their party’s nominations yesterday.

More women than ever will likely win Iowa House seats this November (current number: 28 out of 100). Female representation will almost certainly increase in the state Senate too and could exceed the previous record (ten out of 50 senators in 2013-2014). Follow me after the jump for details.

More Iowa women are running for office in 2018 than ever before, which could lead to record numbers of female state representatives and senators next year.

However, in other meaningful ways, Iowa’s legislature could become less diverse after the November election.

Democrats are fielding a nearly full slate of Iowa House and Senate candidates this year, leaving far fewer GOP-held seats unchallenged than in the last two midterm elections.

The improvement is particularly noticeable in the Iowa House, where Republicans have an unusually large number of open seats to defend. Twelve of the 59 GOP state representatives are retiring, and a thirteenth seat (House district 43) is open due to Majority Leader Chris Hagenow’s move to safer Republican territory in Dallas County.

At least two candidates will seek the Democratic nomination in Iowa Senate district 21, an open seat due to Senator Matt McCoy’s decision to run for Polk County supervisor. Connie Ryan announced her candidacy last week, and Claire Celsi joined the field this morning.

State Senator Matt McCoy announced yesterday that he will run for Polk County supervisor rather than for re-election to the Iowa legislature. His decision to challenge longtime Supervisor John Mauro in the Democratic primary sets up a “epic battle of the titans” in the fifth district, covering the south side of Des Moines, much of the city center and south of Grand areas on the west side. It also opens up Democratic-leaning Iowa Senate district 21.

Connie Ryan rolled out her candidacy yesterday but will likely have competition in the June 5 primary.