Remember, Iowa is a caucus state. You have to show up at night to a meeting place. Listen to all that process stuff and then cast your votes. You must really want to engage in caucus states.
As I was reading this is what I was going to say. It is not just vote, it is a whole evening affair.
I am actually impressed with the turn out if you put it in context:
Two million registered voters split between two parties leaves one million;
Typical 70% turnout and you are down to 700k;
Let's say 1% of the population are snowbirds and you lose another 10k;
10% are working shifts during that time, and there goes another 100k;
Maybe 25% are parents with children at home, so if one stays home and one goes to the caucus you lose another 125k;
We are now down to 465k.
Out of 465k, 200k showed up at an all evening political campaign meeting to listen to speeches (infomercials) by candidate representatives. Are 265k lazy and uncaring? What about those that are gone on vacation, had meetings (work or otherwise), ill, were entertaining visitors, or had a last minute issue come up?
My numbers are not based on anything other than my warped estimates, but based on them if you figure the registered voters are split 50/50 between the two parties you had a 20% turnout. 20% of the registered voters turned out to spend an evening in a room listening to the extremes state their cases. I have been to our spring precinct meetings, and it can take either a chip on the shoulder or alcohol to make it a priority.