What metaphors are used in Master of the Senate: The Years of Lyndon Johnson by Robert Caro?

In Part III, Chapter 20, Caro frequently uses the image of the Battle of Gettysburg as a metaphor for the "Lost Cause." Southern senators, Russell, the historian, first among them, saw the ability to obstruct anti-southern legislation through the filibuster as the region's ongoing revenge for that crushing Union victory. They seem never to focus on the aftermath: President Lincoln's stirring Gettysburg Address, delivered at the dedication of the cemetery honoring the battle's staggering 7,000 honored war dead, because Lincoln's call for reconciliation died with him.