The left has a communication problem, all around the world. Right/conservative types seem very good at breaking their ideas down to very simple messages, and progressive types just don’t seem to be able to communicate in that way.
That’s not the entire story, you even see it in the far left commenters here, they’re notorious for writing an essay in response to a relatively short comment.
Money can be used to buy a lot of marketers, sloganeers, and focus testers. When you’re trying to craft an effective way to deliver your message, it helps to be able to hire buildings full of professional spin doctors.