Virginia Gov. Abigail Spanberger will deliver the official Democratic response to President Donald Trump's State of the Union address on Feb. 24. The high-profile speaking slot has proved to be a mixed blessing in recent years, providing both a national platform for a rising star and the peril of being the follow-up act to a president who has just been wrapped in the trappings of a speech to a joint session of Congress. Most of the response speeches, whether given from a quiet television studio in Washington, a Lousiana living room or a Kentucky diner, have been largely forgettable —...