I was talking to a local Iowa journalist friend of mine this morning. He said he is a registered Independent, and was quite surprised to be called yesterday on his cell phone by the Obama campaign. It's a number that he said only 15-20 people have, and he couldn't figure out how they got it.
It's just one data point, so no reading too much into it. The top three Democratic campaigns have amazing organizations in Iowa, though, probably all better than any past candidate's effort. I have a feeling political consultants will be dissecting for years to come what some are doing here today.