Vote with workers in messy situations — their constituents are diverse (8)

'messy situations their constituents are diverse' is the definition.
I can't judge whether this defines the answer.

'vote with workers' is the wordplay.
I cannot quite understand how this works, but
'vote' could be 'x' (how votes are marked) and 'x' is present in the answer.
'workers' could be 'tu' (abbreviation for trade union) and 'tu' is found within the answer.
The remaining letters 'mires' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?