After a bruising campaign last fall, Californians voted by a 27-point margin in favor of what was billed as an effective ban on cages for egg-laying hens. The Humane Society of the United States, which sponsored the measure, may have won that battle. But the war over Proposition 2, it seems, is just getting started. The egg industry says the proposition might allow it to use cages, and wants an interpretation from the state to support that idea. The Humane Society isn't budging. It says voters meant to enact a ban on cages, and that's what they should get. Meanwhile,...