I grew up in L.A., came to Iowa for college and stayed. Am now in my late 30's. Was not affiliated with any party when I caucused for Obama the first go 'round.
Iowa is an interesting political crossroads for the nation. We have a large percentage of the population above 65 - 15% (http://www.census.gov/prod/cen2010/briefs/c2010br-09.pdf) - and still rural - 36% as of 2010 (http://www.iowadatacenter.org/quickfacts). We are somewhat socially liberal - gay rights are making headway here - and fiscally conservative - our state sales tax is 6%.
Our racial makeup is predominantly caucasian, but we have been welcoming minorities and they are on the increase. Hispanic, Vietnamese, Cambodians, Serbians, Chinese, Ethiopians, etc continue to migrate here and are well represented at my children's school.
Where am I going with this? Iowans as a whole are hardworking people who are very giving of their time and want what's best for the country. We are accepting of others opinions and able to hold rational political discussions. And I think most of us are sick of gridlock in Washington and can see through the political BS (for example, all the posturing during the last round of federal budgeting). The older registered Republicans I've talked with over the last couple of years have told me they can see that Obama has been trying to work with Republican politicians, and it's not his fault things aren't getting done. That's why we re-elected him.
I think Iowa does a good job of being at the center of the U.S., both geographically and politically.