That would be incorrect, in "Washington" (as you have here) they would be negotiating with somebody hired by their candidate. In Wisconsin the voters finally got tired of it.Well, in the case of Washington, the other side won, so the unions didn't buy the guy the were negotiating with, did they, so your argument, FAILS, but the other side bought him, and they are the ones reaping the rewards this time!
I guess then that no one who needs something from the government should be able to contribute to the campaign, like the Koch brothers, say, for instance and no bid contracts.