[bcherry]

Even if this is true, those communities always have the class of people moving through and that class deserves a vote, even if the individuals within it are changing. For instance, take a university town with population of 100k, 25k of whom are students. The students themselves come and go, lasting about 4 years each, but it still makes sense that 25% of the vote each election should go to the student community overall. This doesn't happen for a variety of reasons, but some of them are the sorts of artificial barriers like voter registration that depress the vote of these sorts of communities.