This was my intuitive read too. I thought it was about to say something about the socialists, anarchists, and communists I know.

Nope, just the left handed people I know.

Same, because it's not left-handed people who are more creative, it's lefties in politics who are more creative.

Its a psychology trait of openness that governs curiosity, imagination, and well creativity. This trait also highly correlates with leaning left politically.