In defense of his own executive experience, Barack Obama pointed out that his campaign is a larger organization than the Anchorage suburb that Sarah Palin was mayor of. John McCain’s campaign called this circular logic.
The McCain campaign, happy to talk about Obama’s experience, calls his using his campaign as an example “desperate circular logic” and pointing to Palin’s tenure as governor.
It’s not. Circular logic is when you assume something is true and then you use that assumption as a premise to argue that the original thing you assumed was true… is true. Something like: A is true because B is true because C is true because A is true.