I've been meaning to link to this page on Iowa Politics, which goes through the candidates' 1Q reports filed with the FEC and pulls out a lot of information on money being spent in Iowa. I encourage you to click the link, because there is a lot to learn there.

A couple of things jumped out at me. First, Obama has spent a huge amount of money here (over $630,000), far more than any other contender. True, some of this money seems to be for consulting related to events held in other states, but Obama also has the largest staff in Iowa so far ($152,966 in payroll for 52 Iowa staffers).

A while back I heard that Obama was planning to open 12 field offices in Iowa, which would be costly, but then again, it looks like he's not going to have to worry about penny-pinching.

Not surprisingly, Edwards spent the second-largest amount in Iowa during the first quarter, with  more than $188,000 total, including $87,850 in salary for 20 staffers.

Clinton spent over $123,000 in Iowa during the first quarter, including $68,550 in salary to 15 staffers.

The page at Iowa Politics also includes info on GOP candidate expenditures in Iowa. Click through if you're interested–Romney spent the most, followed by McCain and Tommy Thompson.

Another way to measure how hard the candidates are campaigning here is to look at the time they spend in Iowa. Jerome Armstrong put up this post at MyDD yesterday, tracking the number of events each Democratic presidential candidate held in Iowa, Nevada, New Hampshire and South Carolina during 2007 so far, as well as the number of days each candidate has spent in those states this year.

I recommend clicking the link to look at the table Jerome put together.

Some interesting tidbits: Obama's 13 events in Iowa were geographically dispersed, and he spent 10 days in the state. I think this is smart for him–he knows he can't win the caucuses by racking up huge numbers in a few counties.

Edwards has held 15 events in Iowa, spending 8 days here, mostly in central Iowa. I was a little surprised by this, because Edwards was quite strong in central Iowa in 2004. I expect him to spend more time in the medium-sized cities of eastern and western Iowa later in the year.

Clinton has held 18 events in Iowa, more than anyone else. Most of these have been in the eastern and southeastern parts of the state, which makes sense, because that's where so many votes and delegates are. Dodd has also spent a lot of time in eastern Iowa, while Biden has focused primarily on central Iowa up to now. 

To refresh everyone's memory, here are the eleven largest counties in Iowa in terms of delegates to the Democratic Party state convention. These eleven counties will account for more than half (1,336) of the 2,500 “votes” (state delegates) in Iowa next January. The population center of each county is in parentheses:

County – Delegates
Polk (Des Moines) – 357
Linn (Cedar Rapids) – 202
Scott (Davenport and Bettendorf, the Iowa side of the Quad Cities) – 142
Johnson (Iowa City, University of Iowa) – 137
Black Hawk (Waterloo) – 117
Dubuque (Dubuque) – 90
Story (Ames, Iowa State University) – 76
Woodbury (Sioux City) – 68
Pottawattamie (Council Bluffs, across the river from Omaha, Nebraska) – 55
Clinton (Clinton) – 46
Cerro Gordo (Mason City) – 46