When a prominent Washington peace activist was asked recently to name the leading anti-interventionists in the Senate, he responded, “Rand Paul and Mike Lee,” both Republicans. Democrats are in the midst of a furious struggle over what they stand for and who is included in their coalition, yet on foreign policy questions, their silence is deafening. When President Trump decided to drop 59 cruise missiles on Syria in response to purported use of chemical weapons, there was more debate about the attack among Republicans than among Democrats.