"Most of our election workers are volunteers and we couldn't do without them, but there are other workers who need to be paid - we can't ask them to put in 14 hour days seven days a week without money to live on."
That would need to be read out in a bleating voice-over to accompany pictures of sad-eyed, haggard election workers. It seems to work for rescuing donkeys.
I have to say that I don't receive many request for political contributions, which is just as well as they would be wasting their time, whichever party was asking and whatever reasons they were giving.