Mark Penn, a former Clinton adviser and the author of “Microtrends Squared,” joins us to discuss how trends among small cohorts can lead to broader change. Plus: Is it fair that two transgender athletes dominated in a high school girls sport competition?
Podcast: How Microtrends Drive Change in Politics
Author Mark Penn says there are plenty of "closet conservatives" in the United States. (Photo: Richard Gray/ZUMA Press/Newscom)