>>11254396>According to which news media outlet?
It's just an observation, similar to the observation that academia is full of liberals. These are not coincidences.
Smarter people are more willing to spend the time collecting data and facts, and to spend the time reasoning about them, without being unduly influenced by baseless fearmongering and mandates from holy books.
Liberalism is not a specific set of values. It's a mindset. Take for example the founding fathers of America. They were high IQ liberals in their time (e.g., imagine suggesting something as radical as not answering to the King).