Now that the deadline to compete in the Democratic or Republican primaries has passed, the field of candidates is set in most of the 100 Iowa House districts and 25 Iowa Senate districts that will be on the ballot this fall.

It’s time for a first look at chances to increase diversity in the state legislature for the next two years. The proportion of white lawmakers is unlikely to change, while the proportion of women could move in either direction.

Thanks to Iowa's non-partisan redistricting process, we have an unusually large number of competitive state legislative districts. In any given general election, depending on candidate recruitment, between one dozen and two dozen of the 100 Iowa House districts could be up for grabs. Democrats and Republicans spend big money on a much smaller number of districts; this year, only seven Iowa House races involved a large amount of television advertising. But the parties and candidates invest in direct mail and/or radio commercials in many more places than that.

Republicans go into election day favored to hold their Iowa House majority, which now stands at 53 seats to 47. Carolyn Fiddler has pegged seven "districts to watch" at her Statehouse Action blog, and in September, the Des Moines Register's Jason Noble discussed five districts he viewed as "key to Iowa House chamber control." I see the playing field as much larger.

Follow me after the jump to review 20 Iowa House seats that will determine control of the chamber for the next two years.

Caveat: most years, there's at least one shocking result in an Iowa House district neither party had their eye on. I'm thinking about Tami Weincek defeating a longtime Democratic incumbent in Waterloo in 2006, Kent Sorenson defeating a Democratic incumbent in Warren County in 2008, three Democratic state representatives who had run unopposed in 2008 losing in 2010, and Democrat Daniel Lundby taking out the seemingly safe Republican Nick Wagner in the Linn County suburbs in 2012. Wagner had run unopposed in the previous election.

So, while I don't expect any of the "favored" seats discussed below to change hands, I would not rule out a surprise or two. That would be excellent news for the stealth challenger's party.

Over at the Smart Politics blog based at the University of Minnesota's Humphrey School of Public Affairs, Eric Ostermeier takes a look at the uncontested Iowa House districts today. He leads with this surprising fact: "Iowa Republicans failed to field candidates in a party record 32 State House districts this cycle." I recommend clicking through to read his whole post, which explores historical trends in Iowa House candidate recruitment for both parties.

Bleeding Heartland previously commented on the uncontested Iowa House races here. After the jump I've posted my thoughts on Ostermeier's analysis.

I'm posting the weekend thread early, because the filing period for primary election candidates in Iowa closed this afternoon. The Secretary of State's Office posted the full list of candidates here (pdf). John Deeth has been covering the filing on a daily basis all month at his blog. Some highlights from races I'm watching are after the jump.

This is an open thread; all topics welcome.

UPDATE: Gotta agree with Senator Chuck Grassley: the History Channel is useless.

Via John Deeth's blog I learned that former State Senator Rich Olive has dropped out of the race for the new Iowa House district 48. Olive had announced his candidacy in June, but in a recent Facebook message, he indicated that he does not want to move out of his Story City home. Last month Republican State Senator Rob Bacon, who defeated Olive in 2010, announced his candidacy in House district 48.

After the jump I've posted Olive's full statement from Facebook and a map of the district. It covers Gilbert and rural areas in northwest Story County, Madrid and several townships in eastern Boone County, much of eastern Webster County and all of Hamilton County. As of April 2011, House district 48 contained 5,991 registered Democrats, 6,445 registered Republicans and 7,300 no-party voters.  

UPDATE: Rich Olive withdrew from this race in October 2011.

One of last year's competitive Iowa Senate races will be replayed in the new Iowa House district 48 in 2012. The swing district is located in the central part of the state, covering part of the area where Republican State Senator Rob Bacon defeated Democrat Rich Olive in 2010.