Idiom
He is always standing up for the weak and oppressed.

Seeking help of others for
Moving about with
Championing the cause of
Boosting the claims of

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Idiom
To bring one's eggs to a bad market

To show one's talents before audience which is incapable of appreciating them
To face a humiliating situation
To bring one's commodities to a market where there is no demand for them
To fail in one's plan because one goes to the wrong people for help

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