The REAL Car/Ditch Metaphor
The Republicans were driving, breaking the speed limit and going all over the road. The Democrats were in the passenger seat riding along until a couple of years ago when they grabbed the wheel. These two, fighting over the wheel and slamming the gas, drove us into the damn ditch. The Democrats told the Republicans to get in the back seat and decided to try to drive out of the ditch, figuring that if they went far enough and fast enough, the side wouldn't be as steep, and they'd pop right out onto the pavement.
It didn't work. The ditch got steeper, and the car slid down the edges further away from the road. Now the Republicans are saying that's time to stop the car and call a tow service (Tea Party Towing) to get the car out of the ditch before we bust more tires than we have spares and run out of gas to boot. But the Democrats are sure that if we let them drive just a little longer and let them hit the gas just a little more, they're sure to get us back on the road in fine shape.
That's the real driving metaphor. We don't want the car in D for drive, and we don't particularly want it in R for reverse. We want it in P for park. So stop passing thousand-page laws, stop spending money, just hold still so we can pull it out and get it to a mechanic before the bozos driving it cause real irreversible damage.