Few Iowa politics watchers doubt that Democrats will gain ground in the state House today–the only question is how much will the Republican majority shrink.

In contrast, the Iowa Senate landscape could shift in either direction. Republicans now hold 29 seats and are unopposed in Senate district 1, where independent Senator David Johnson is retiring. They are also outspending several Democratic incumbents in districts Donald Trump carried in the last presidential election. Democrats currently hold 20 Senate seats, but they could add to their ranks today, despite a difficult map and a couple of bad breaks over the summer.

Here’s how the key races look going into election day, based on voter registration totals, recent voting history, absentee ballot numbers, and where Democratic or Republican leaders have made large expenditures.

As was the case two years ago, Democratic candidates are at a financial disadvantage in almost all of the Iowa Senate districts both parties are targeting.

The disparity adds another challenge to a party already facing a difficult path to gaining ground in the upper chamber. Republicans currently hold 29 of the 50 Senate seats and are guaranteed to pick up the district independent Senator David Johnson is vacating.

Five weeks before the general election, the Republican Party of Iowa has begun airing television commercials to promote Senate Majority Leader Jack Whitver and State Senator Julian Garrett.

The advertising suggests that Republican internal polling shows Democrats Amber Gustafson and Vicky Brenner within striking distance in Senate districts 19 and 13, respectively. Democratic internal polling presumably shows competitive races too, since former President Barack Obama included Gustafson and Brenner on his list of Iowa endorsements this week. Only five state legislative candidates made the cut.

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.

Polls close at 9 pm, and I’ll be updating this post regularly with primary election results. Rumor has it that turnout was relatively low, even on the Republican side where there are hard-fought primaries for U.S. Senate and the third Congressional district. According to the Polk County Auditor’s office, as of this afternoon only 1,506 absentee ballots had been requested and 1,350 absentee ballots received for today’s GOP primary. Keep in mind that roughly half of all Republican voters in IA-03 live in Polk County, and six campaigns were competing for their votes. Not to mention that five U.S. Senate candidates should have been locking in early votes in Iowa’s largest county.

By comparison, 2,883 Democratic primary absentee ballots were requested in Polk County, and 2,296 of those returned by today. The lion’s share were from Iowa Senate district 17 in Des Moines, where three candidates are seeking to replace Jack Hatch (2,475 absentee ballots requested and 1,950 returned). Democratic campaigns have long pushed early voting more than Republicans, but still–that’s a shocking failure to GOTV by the various Republican campaigns.

Share any comments about any Iowa campaigns in this thread, as well as any interesting anecdotes from voting today.

UPDATE: Polls are now closed and updates will continue after the jump.

State Senator Brad Zaun will have company in the Republican primary to represent Iowa’s third Congressional district. Today David Young told the Des Moines Register that he is ending his U.S. Senate campaign to run in IA-03.

In an exclusive interview, Young said when he began pondering a run for elective office he had the 3rd in mind, assuming that Latham would run for the Senate seat opened by U.S. Sen. Tom Harkin’s retirement in 2014.

Shifting to the Senate race made sense once Latham took himself out of that contest. As of September 30, Young had $124,052.27 cash on hand for his Senate campaign, which would go further in a Congressional district than in a statewide primary.

Meanwhile, Iowa Secretary of State Matt Schultz announced today on Facebook, “I have received a lot of support and encouragement as I have considered becoming a candidate for Iowa’s 3rd Congressional District. Next week, I will be making an important and exciting announcement about this race and my future plans to fight for Iowa.” I’m no marketing guru, but I think it’s more exciting to say what you’re doing than to promise “an important and exciting annoucement” soon. I suppose the idea is to make the news twice instead of once. Zaun took the same approach.

I agree with John Deeth’s preview of a forthcoming IA-03 Republican debate: “Mr. Schultz, explain your position on the farm bill. ‘Voter ID.’ Should we intervene in Syria? ‘Voter ID.’”

State Senator Jack Whitver confirmed today that he will run for re-election in Iowa Senate district 19 rather than run for Congress in IA-03. Likewise, State Representative Chris Hagenow will pass on the Congressional race to seek re-election to House district 43 and as House majority whip. In a message to supporters, Hagenow wrote, “Serving in Washington D.C. at this time will not allow me to be the husband and father that I have promised to my family.  After prayerful consideration, we believe that I can best serve the people of Iowa by continuing my work in the state legislature.”

The Daily Kos Elections team has been compiling 2012 presidential election results by state legislative district as well as by Congressional district. Yesterday the Iowa numbers were added to the database. You can view Google documents with raw vote totals and percentages for Barack Obama and Mitt Romney by Iowa Congressional district here, by Iowa Senate district here, and by Iowa House district here.

Looking closely at the presidential vote in the legislative districts provides some insight about where the competitive Iowa statehouse races might be next year. After the jump I’ve highlighted some key data points related to the Iowa Senate races. Later I will post a separate diary with first thoughts about the Iowa House districts.