So, they are claiming that the past 40 years prove that conservatism fails (despite the fact that America has remained one of the most prosperous nations in the world, and the fact that we are one of the most, if not the most, immigrated to nation).
What do the past 100 or so years show about liberalism/Socialism/Communism. The Soviet Union collapsed, but communism killed millions before that happened. The majority of the Chinese are horribly poor, despite over fifty years of communism. North Korea can't feed itself. With all these sterling examples, do you think the DUmmies might concede that Communism, ie "Progressive Politics" doesn't work?