Reading the Same Selection from PostGIS Twice?

[Bill Thoen]

I've got a situation where I'm pulling the same selection of US county 
polygons from PostGIS in two LAYERs because I want filled polygons in a 
separate layer than the polygon outlines. I can make this work by 
defining the same DATA selection statement for each LAYER, but doesn't 
this hit the PostGIS server twice? Is there a way to select the geometry 
from the database once and then split the selection into separate 
POLYGON type and LINE type layers within the MAP object?