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<p>Blue Shield of California, one of the state's four major health insurers, has a sales office on the 20th floor of the Pacific Corporate Towers in El Segundo. Had the employees peered down to the plaza on a recent Tuesday morning, they would have seen a small cluster of picketers.</p>
<p>From 300 feet up, it would be impossible to read the signs, or hear the chants, or smell the aroma drifting off the white pickup truck that was parked below in a loading zone. But on the ground, the scent is unmistakable: manure.</p>