Words to the effect of "we live around people who act and feel like us":
Yeah, but maybe not for the reasons you think. I'm not sure the reasons are a priori discoverable, although they can be revealed by statistics. Or to put it another way "is it something in the water, or new car smell?" So something happens in groups which amplifies similarities.
The State of Washington collects voting results by precinct, and precinct sizes are typically in the hundreds of voters.
* http://athena.m3047.net/elections/36th-dist-colored.html
The distributions are not normal.
* http://athena.m3047.net/elections/dist-not-normal/distributi...
What got me started with this was King County making their canvass available in digital form. At the time I was feeling bored and like I needed some additional exercise, and publishing a quarterly zine and knocking on doors and delivering it to everyone in my precinct seemed like a natural thing to do; I had the thought that I might be able to see some effect, of some kind, in the canvass for my precinct (just a rather arbitrary notion, I like measuring things). As I kept doing this over a number of years it gained the attention of the established political order.
Anyway I started clustering the results because I had the software, and hammer... nail.
* http://athena.m3047.net/elections/perl/data-index.cgi?imagem...
One of Cialdini's "weapons of influence" is "liking", and again that may not mean exactly what you think it does. There was contemporaneous research going on about this. One of the notions was that you would be more likely to sway people who were "like" you. So where do you find these people? Well, maybe in precincts which vote similarly to yours. So this raises an issue for politicians: maybe they should identify people who are on their side in places where they are weak and prevail on those people to talk to their neighbors. Just a thought. But the reality was that trying to get for instance a "90%-er" to go to actively meet and court "40%-ers" was like asking them to lick dog vomit. On the other hand I used cluster correlations to identify an "like" precinct in another part of the City and took a walk; I was shocked at how similar it was in terms of physical features. I know, I know, confirmation bias.
* http://athena.m3047.net/elections/perl/cluster-correlate.cgi...
I suppose it does take a certain mindset to make knocking on stranger's doors a good time; and I don't know that that is a good idea everywhere. But I like talking to strangers, hearing their stories, and flipping each other shit. It's a skill which has served me well in my life.