Almost everyone's heard someone say something to the tune of, "Man, my mom is such a monkey on my back!" I personally haven't, but I'm usually the last in on these things anyway, so I'm just bitter about being left out. Still, I think the "monkey on the back" metaphor is equally effective and appropriate for the description of the role of the state to the nation.
Imagine this: You represent the nation, and the monkey takes the role of the state, an entirely separate entity (linked by his painful clutching to your back, shoulders and occasionally your head) that you don't need to exist, but you allow him to stay for the little things he does, originally intended to help you.
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