I'm in a solid red state. I believe the "average American" is further left than you do. Centrism is a lie that has been shoved down our throats by every media outlet for most of my adult life. For the first time in my lifetime, most of us have access to media that isn't controlled by the ruling capitalists. The center left alignment will continue to swing further left so long as this is the case. I know that 30% of the populace would vote right regardless.... But that 40% will be responsive to progressive messages, which are frankly working class messages, when most of them are in the working class these days.

Edit: btw, i respect your perspective, which was close to mine not long ago