With the Ukraine inquiry complete and the ink long dry on their 300-page report on the matter, Democrats find themselves in a complicated position next year. It’s the day after Adam Schiff made one last speech on the floor of the House of Representatives arguing that Donald Trump must be impeached. The California Democrat was back at work, headed to the secure room underneath the U.S. Capitol where, over the course of the last three months, his House Intelligence Committee conducted its impeachment investigation. The inquiry shaped charges that Trump abused his power by pressuring Ukraine to do him political...