You are right about at least one thing: Most intellectual BY PROFESSION are liberals.
I can add something for you: Arguably the most famous intellectual Einstein is an ultra liberal socialist.
However, being intellectual convincing or not is not by vote nor by fame.
So may be I missed something: Tell me what's your liberal's intellectual presentation is the most convincing and worth reading.
I give you Hayek, Friedman and Ayn Rand. What are yours? I already read Marx.