Anil states "The real problem I had with this map is:
"Made me wonder--how does proximity to water effect voting orientation?"
 
Dammit, Peter isn't it a usability sin to confuse "effect" and "affect"? I should think so"

Then you think wrongly, Anil. "Effect" may also be a verb, with the specialized meaning of "bring about" or "cause to happen;" as in - how does the proximity of water bring about voting patterns and predilections.

In any event, this syntactical subtlety is hardly a real problem of the map and it's demographic exploration.