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.

Radio commercials appeared in several competitive Iowa Senate districts during the last week of September, coinciding with the start of early voting. This week, the Republican Party of Iowa has launched the first negative radio spots I’ve heard in state legislative races this year. After the jump I’ve enclosed the transcript of the ad attacking Chaz Allen, the Democratic candidate in the open Iowa Senate district 15. Allen’s own positive ad, which Bleeding Heartland transcribed here, is still in rotation and promotes the former Newton mayor’s record of recruiting businesses. The new Republican spot blames Allen for high property taxes that allegedly discouraged companies from coming to Newtown after “Maytag pulled out on Chaz Allen’s watch.” The ad also plays up Governor Terry Branstad’s support for Crystal Bruntz, the Republican candidate in Senate district 15. While the ad asserts that Bruntz “understands job creation,” it fails to mention anything substantive she has ever done to create jobs.

In Iowa Senate district 41, a leading pickup opportunity for Democrats, Republican State Senator Mark Chelgren’s new radio spot highlights flippant and sarcastic responses Siegel mailed in response to a survey Chelgren circulated in 2010. More details on that commercial are after the jump.

In the open Senate district 39, another seat targeted by both parties, a Bleeding Heartland reader tells me that the new Republican radio spot attacks Democratic nominee Kevin Kinney over his support for “Common Core” educational standards. I have not heard the ad yet and would appreciate any further details. It seems like an odd angle for an attack, but I guess Kinney’s background as a deputy sheriff and family farmer didn’t give them easy targets. Politics-watchers generally believe that education is a campaign issue favoring Democrats. As far as I can tell, fear-mongering over Common Core only resonates with social conservatives who would already be voting for Kinney’s opponent, Michael Moore.

I have not yet heard details on radio spots attacking State Senators Daryl Beall or Rita Hart, the Democratic incumbents in Senate districts 5 and 49, respectively. Nor have I heard of any attack ads against three-term Democratic incumbent Amanda Ragan in Senate district 27, although anecdotally, Republicans have supposedly given up on taking back that seat. I always appreciate tips from Bleeding Heartland readers, so please let me know if you’ve heard radio ads in the Fort Dodge, Clinton, or Mason City area.

In the open Iowa House district 55 (northeast Iowa), Republican Daniel Branhagen started running a commercial this week calling his Democratic opponent Rick Edwards a big spender. I haven’t heard attack ads against any Iowa House Democrats yet on Des Moines area radio stations.

Any comments about the state legislative races are welcome in this thread.

The Daily Kos Elections team has been compiling 2012 presidential election results by state legislative district as well as by Congressional district, state by state. Last week the Iowa numbers were added to the database. I took a first stab at previewing the battle for control of the Iowa Senate next year, using data including the raw vote totals and percentages for President Barack Obama and Mitt Romney in each district.

The Daily Kos database includes Obama and Romney vote totals and percentages for each Iowa House district here. After the jump I’ve incorporated that information and other factors to predict which Iowa House districts will be competitive in 2014. Writing this post has been challenging, because every election cycle brings surprises, and many more seats in the lower chamber will be in play. Unlike the Iowa Senate, where only half of the 50 members are on the ballot in each general election, all 100 Iowa House members are on ballot in every even-numbered year. Republicans currently hold a 53-47 majority in the lower chamber.