Local politics factor into the legal considerations of PPPs as do worker and union concerns. PPPs are sometimes viewed as a means of "union-busting", and may mean job loss to local communities.
Shifting public workers to the private side either through direct hire, "leasing", of employees, or finding a position for them in another public agency should be considered in a PPP proposal. There is little chance of closing the deal if the project becomes politically charged before the proposal is even submitted.