It is a favorite meme of the left that Watergate was " a constitutional crisis." It was not. The Constitution was never in doubt, never threatened or violated, never compromised. Liberal news columnists at the time loved the excitement of a crisis though, and pushed that story line to the max. Like most leftwing lies, it stuck and became part of the conventional wisdom.
Corruption is way bad and criminal, but by itself it is not an attack on the Constitution.