I visited a friend this November who was working in Des Moines on one of the Iowa caucus campaigns - they were working on the precinct level, like Dukakis wants nationwide. It's actually pretty crazy, the system the Democrats have. Every time someone calls you or knocks on your door, any issue or candidate preference you mention gets added into a giant database. That way, when they canvass, they print out street-by-street guides to the people living at each house (are they Dems, who did they say they liked in the past, what issues should they be sold on). After the primaries are over, all the data that the individual campaigns entered gets added together so that the final nominee can see it. I imagine that with competitive races in so many states, that this process is happening everywhere.