“Tonight, we renew our resolve that America will never be a socialist country.” That’s from President Donald Trump’s last State of the Union address. I’m sure many people found it as encouraging as I did, especially in light of surveys indicating that socialism is gaining popularity here in the United States. And not just at the fringes. One recent Gallup poll showed 4 out of 10 Americans have a favorable impression of socialism. Almost half—47%—said they would vote for a socialist candidate for president. But don’t despair just yet. The same poll also revealed that almost 2 out of every...