Conservatives leave factual details of their positions to their strategists and leaders. The further down the food chain, the the less interest there is in facts and the greater interest in myths. Myths are easy to digest and contain just the right amount of theatricality to entertain while presenting values. Think Arnold. Knowing how to manipulate facts helps to create the myths.
Progressives have not used this as a strategy for influence because of our desire to focus on the scientific method for truthful answers. The vast majority of Americans get their information in sound bites or headlines. There is no broad brush to paint myths for progressives and we don't want to be led with deception and manipulation.
So what is the solution?
Create a broad progressive brush based on facts to present our values.