True that.
I still think that Christie would win, but his margin would be much less. Holding both elections in November would hurt the Republicans in the down-ticket races.
The Democrat machine normally only gets cranked up once every couple of years -- now it has to be cranked up three times. It isn't cheap to drag their core voters out to the voting booth.
You've come up with something that no one else has noticed. It would appear that Christie's plan is to break the New Jersey Democratic Party's bank. I wouldn't characterize it as a chess move. More like a poker move.