The many-headed Hydra, with breath poisonous enough to kill, is one of the more gruesome beasts in Greek mythology. In Hercules's great clash with it, he would cut off one of its heads, only to have two more appear. No matter what he did, he couldn't keep up.
You can think of Congress's efforts to pay for health reform as being a little bit like a battle to slay a many-headed Hydra.
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