Liberals are like sharks. If they stop moving, they die. Sharks continually move forward to keep the relatively low oxygen content in salt water moving past their gills (which are exposed on the sides of their heads). The consumed CO2 is wafted away, some O2 floats by and is taken up to support the shark's metabolism. If a rope is snagged around the shark's tail and it is dragged backward in the water, it will die of asphyxiation. Same is true of a liberal if ever they have to retreat from a position.
Of course, if they die as a liberal, there is every chance that they shall be reborn as a neo-con. And for some, this is a seriously dreaded fate.
You are really being condescending towards sharks!! :-)