Mullally driving an F-150 is just as bad a perception as Wagoner driving an SS Camaro would be.
I agree all three CEOs should drive their most economical vehicle either in production or ready to be produced. If I were Rick, I'd snatch the keys from the engineers working on the Volt and drive it to Capitol Hill. If it breaks down because it's not ready to go, there's always GM's 24 hour road side assistance