democratic principles that stand as a 'bulwark' against tyranny
a 'bulwark' of freedom [=something that protects freedom]
the ship's high 'bulwarks'
(..) - The right VP would help all this. - Have you had any further thoughts? My short list is the same. Westervelt, Clark, Klein. Klein would be the strongest bulwark against calls for your impeachment. - Swallowing poison to stay alive. - Alive is good. I don't think I can stomach Klein. (..)2017 TvShow: House of Cards Title: Chapter 65 Season: 5 Episode 13