McCain is the carrier deck, Palin is the F-18 taxiing up to the catapult. It takes four years to turn the USS McCain into the wind for launch, and that's plenty of time to do a systems check on the VP.
We throw our bag aboard the USS McCain 'cause if the trial lawyers' and enviro-lobbyists' booze-cruise that is the MS Obama puts to sea, it'll throw a prop and drift around in left-hand circles and it might take eight years to beach the thing.
Also, I should start reading Jim Treacher regularly. Cookie made of dreams!