I think there are parallels to the unfortunate political situation in which we find ourselves. And this is probably the key to the ultimate solution:
"New scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die." -Max Planck
Fundamentalists, conservatives, and teabaggers all alike stand in opposition to the great ideas we know work, beginning with the scientific process itself. I would include with that the great economic experiment we call The New Deal. Many good things happened for many people as a result of The New Deal. Not perfectly but they did. In typical fashion, the conservative response to things that we're not working well has been to destroy the whole thing rather than fix it.
They've had 30 to 40 years to implement "supply-side economics" (or, "Austrian School" economic policy) in its place here in the US. They've even had a chance to implement these policies in smaller countries throughout Central and South America (most prominently, Chili). What they've succeeded at doing in all cases is to make a spectacular mess of things and cause untold suffering. You'd think the evidence before them would convince them of their folly. You'd think that a reasonably sane person would stop supporting these efforts. Instead they march on like blind, loyal idiots, leaving their mess for future generations to clean up.
As this video explains so well, it takes more than factual evidence to convince people. Unfortunately, it takes the passing away of the oppressive ignorant. When a new generation of people can learn unimpeded, they can decide for themselves what is best. After all, it is our descendants that must live with the consequences of our actions, just as it happened to us in turn. Only conservatives and fundamentalists need propaganda and manipulation. We need only to present ideas to open minds and allow truth to speak for itself. If we are shown to be wrong, we stand corrected and move on. If a fundamentalist is shown to be wrong, they are thrown into a life crisis that threatens their very foundation.