speak on somebody's behalf

Some may wonder why I ever spoke on their behalf.

If it were up to me, I would speak on your behalf.

They agreed that the union would speak to baseball on the players' behalf.

Others at the bank were reluctant to speak on his behalf.

Many have no close relatives to speak on their behalf.

He told me you spoke to him on her behalf.

The others came to our room to talk about who should speak on their behalf.

I will therefore be speaking on his behalf this evening.

There were a few others who spoke on your behalf, I heard.

James spoke on our behalf at negotiations with management last week.