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<p>Actually, I think the causation is the reverse - that the undergrads of a particular school tend to find their respective law school to be the most attractive. The rationale is quite simple. People tend to be creatures of habit. Nobody likes to move. So if people are given the choice of staying where they are, they tend to do so. Once you get used to a certain area, you tend to want to stay. Couple that with the fact that you may have a boy/girl-friend who may not be able to move (i.e. because he/she hasn’t graduated yet or she has a good job in the area), and long-distance relationships are a pain. </p>
<p>Hence, rather than the law schools preferring their own undergrads, I think it’s more that the undergrads prefer their own law schools.</p>