Imagine two pilots are flying in a small plane. The plane runs out of fuel and begins to crash.
There is one parachute in the plane. If either pilot takes it for himself, he'll survive unscathed, but the other pilot will die. But if the pilots cling to each other as they use the parachute together? They'll come away from the crash with some broken bones, but both of them will still be alive.
Now imagine that the two pilots are sitting in the cockpit as the plane falls, arguing not over who gets to use the parachute, but who's going to take the blame for the crash.
That's about what the debt ceiling debate looks like to me right now.