The Kentucky senator, seeking to define himself as a foreign-policy heavyweight ahead of 2016, will introduce a measure in the Senate next month declaring war on the terror group. “The most important” part of Rand Paul’s assessment of “questions of war,” the Kentucky senator told The Daily Beast this fall, is “how you go to war.” Now he’s putting that assessment into action with a plan to introduce a declaration of war against ISIS in the Senate next month. The move is part of Paul’s ongoing campaign to position himself as a foreign-policy heavyweight ahead of the Republican presidential primaries,...