(noun) A person who displays insufficient fortitude or toughness in a difficult or uncomfortable situation; by extension, a person or thing which is inadequate to the purpose at hand. Can be turned into an adjective by adding -ed ("candy-assed"). Frequently heard in the military.
"He was too much of a candy ass to do a hundred push-ups and run ten miles before breakfast."
(noun) By metaphor from the Jewish religious role, an older, more powerful or higher-ranking person in the corporation where one works (but usually not in the chain of command) who can give good advice about office politics, and may be able to pull strings, remove heads, or otherwise provide protection from hostile forces.
"They tried to put me on the plank but I got on the horn to my rabbi and everything was fixed immediately."
(noun) A person, especially a member of a political party or a military organization, who is hardcore, who endures during hard times. The opposite of "summer soldier", a phrase used by Thomas Paine to denote (and mock) men who signed up for the Revolutionary War and then quit when the going got tough.
"Most of that outfit quit, but the winter soldiers are still hanging on."