The biggest reason young Americans tend to lean to the left is that they grow up immersed in liberalism. Their entertainment, music, teachers and college professors lean to the left. Meanwhile, since few young Americans follow politics avidly or are out in the real world enough to feel the sting of left-wing policies, the only place they typically get to hear the conservative position is from liberals. That’s like getting the history of WWII from Hitler – or Noam Chomsky, either/or – and expecting to get an accurate picture of what the Allies believed. That puts these kids in a...