I agree, but would go further and argue that the belief that "all politicians lie" is itself a problem with negative effects. Since we have a competitive system

I agree, but would go further and argue that the belief that "all politicians lie" is itself a problem with negative effects. Since we have a competitive system and a self described political entertainment complex, everyone running for office will be described as a liar. However, when an actual compulsive (pathological and self admitted?) liar is elected to congress, the belief that "everyone does it" serves as a justification for doing nothing. It misses the forest for the trees and provides an excuse for allowing the very problem it describes to grow and become worse.