Vladimir Kara-Murza, a Russian opposition politician and Washington Post contributing columnist, has been detained since April. His wife Evgenia is advocating for Vladimir and other activists and journalists who have been swept up amid Russia's crackdown on dissent. She tells Brian Stelter that "Russia can be different" and "we need to make it harder for those who would try to be silent about it." To learn more about how CNN protects listener privacy, visit cnn.com/privacy