What the Fallacy?!
Ambiguity
The Definition
Using double meanings or ambiguities of language to mislead voters or avoid committing to a position.
The Explanation
Politicians frequently use 'weasel words' or ambiguous phrasing so they can later claim they didn't technically lie if their actions contradict voter expectations.
Political Example
The candidate promised 'no new taxes.' Once elected, he introduced a series of 'mandatory public contribution fees,' arguing they weren't technically taxes.