The Democratic Operative Who Beat Trump on Facebook Is Bracing for the War Ahead U.S. President Donald Trump leaves the White House to visit troops at Walter Reed National Military Medical Center December 21, 2017 in Washington, DC. Photo: Chip Somodevilla/Getty Images By Alex Pasternack Tara McGowan should be celebrating. Acronym, her three-year-old political outfit, placed a $100 million bet on a digital-first campaign…