It's much harder to do. If they vote it out they are all on record. If it dies on it's own they don't get blamed. This is why the unions didn't fight any where near as hard to stop it in NJ. Also, WI ends tenure and automatic deduction of union dues.
What Christie did was great, but nowhere near as sweeping and he didn't face the same level of opposition. I think the unions winked at the whole thing because they know it's only a 4 yr set back.
Ok - I see what you are saying