There is absolutely no chance Republicans can win a statewide election in New Jersey in a Presidential Election Year.
Welcome to the forum.
I disagree though on NJ. Guiliani is in good position to win NJ, if he is up against Clinton in '08. That could drive enough votes to elect a Republican like Tom Kean Jr. Lautenberg is too old and seems to be out of touch with NJ to win if Guiliani is running for Preisdent in '08.
Bush won NJ in 1988 with 56% and that didn't stop Lautenberg from getting 54% against a top-tier opponent.