In the entire history of the United States of America, from George Washington's election in 1789 on down, has there been a single candidate as unmoored from ideological principle or belief as Mitt Romney?
Beats me. I'm not enough of a historian to know. But it's worth noting that this isn't necessarily a knock on Romney. Liberals have been banging away on Multiple Choice Mitt for a long time, but the fact is that lots of voters probably aren't bothered by this. They like the idea of a president who's pragmatic and non-ideological, willing to change his mind to fit changing circumstances instead of fitting everything into a liberal or conservative straitjacket.
I'm not saying this is what Romney actually is. I'm just saying that describing him as "unmoored" might not be nearly the insult we think it is.