At this time four years ago, Barack Obama’s campaign had about 30 field offices up and running in Iowa, compared to six offices for Republican presidential candidate John McCain.

Obama’s campaign has had eight Iowa field offices open this summer and is rolling out another 26 offices around Iowa this weekend. So far, Mitt Romney’s campaign has ten Iowa field offices, in addition to the unified Republican headquarters in Urbandale.

After the jump, I compare the field office locations for each presidential campaign, grouped by Iowa Congressional district. Where relevant, I’ve also noted competitive Iowa House and Senate districts near the Obama and Romney field offices, although I doubt either presidential campaign will do much for down-ticket Democratic or Republican candidates.

The redistricting process and several Republican retirements have created many pickup opportunities for Iowa House Democrats. The devastating 2010 election left them nowhere to go but up in the lower chamber, where Republicans currently enjoy a 60 to 40 majority. Relatively few sitting House Democrats represent vulnerable districts.

Speaking to activists at the Polk County Democratic convention on March 10, I heard lots of optimism about the House races. After the jump I’ve posted some early thoughts on the seats up for grabs.

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.

The state agency Iowa Workforce Development has replaced 36 field offices with hundreds of new “enhanced access” computer terminals this year.

Although the shuttered offices are unlikely ever to reopen, they may live on as talking points in many competitive Iowa House and Senate races next fall.

Democrat-turned-Republican Brian Moore announced yesterday that he will seek a second term in the Iowa House, setting up a re-match with Democrat Tom Schueller in the new district 58.  

Former State Representative Tom Schueller is running as a Democrat in the new Iowa House district 58, setting up a likely rematch against first-term Republican Brian Moore.

Reading up on the carnage that was last week’s Congressional elections, I noticed that two House Democrats lost their seats despite having run unopposed in 2008. The unlikely losers were Rick Boucher in Virginia’s ninth district and Phil Hare in Illinois’ seventeenth district, including the Quad Cities area (though polls had shown Hare in trouble this fall).

I wondered whether any Iowa Democrats suffered the same fate. It turns out that three of the 13 Iowa House incumbents defeated last week did not have a Republican opponent in 2008. In each case, special circumstances may have exacerbated the generally bad environment for Democratic candidates this year.

Democrats suffered big losses in the Iowa House and Senate last night. Assuming no results change through recounts, the House is likely to switch from 56 Democrats and 44 Republicans to 59 Republicans and 41 Democrats. I’ve seen some online references to a 58-42 split, but that’s not how the count looks based on unofficial results posted on the Secretary of State’s website.

Democrats maintain control of the Iowa Senate, but their majority shrank from 32-18 to 27-23. Governor-elect Terry Branstad should easily be able to get his agenda through the Iowa House, and Senate Majority Leader Mike Gronstal may have trouble keeping his caucus united.

UPDATE: Late returns could change the outcome in two Senate seats; it’s possible the chamber could have a 25-25 split, or a 26-24 Democratic majority.

SECOND UPDATE: A few more races could switch as more absentee ballots come in. As of Wednesday evening, Democrat Tom Schueller is now trailing in House district 25 by about 150 votes.

Here’s my take on the seats that changed hands and the near-misses.