Willow in the wind

[T]he CAB has rightfully seen Congress as a willow in the wind, bending to the wishes of whatever special interest groups and businesses speak loudest.

Justice is not a willow in the wind; justice stands immutable against unjust forces.

If he has to vote against taxes, he will—and his vote won't change from day to day: “I'm not gonna be a willow in the wind.”

Ethics begin to feel situational, a balancing of concerns. When this happens, we no longer have any firm ethic to stand on. We become an ethical willow in the wind.