America is in a “constitutional crisis.” Trump Administration officials have “decided that they’re not going to honor their oath of office.” President Trump is “almost self-impeaching” and “is every day demonstrating more obstruction of justice.”

All of these are quotes in the last 48 hours from House Speaker Nancy Pelosi, who will soon have to hire a lexicographer to come up with new ways to say that Mr. Trump is committing impeachable offenses. How many synonyms are there for “obstruction”?

Yet...