I wouldn't be so pessimistic about Booker's chances.
1. NJ is a clearly Democratic leaning state.
2. NJ Democrats have picked consistently poor quality candidates and won anyway.
3. Christie received only 48% of the vote against Jon Corzine.
4. Cory Booker is an extremely talented candidate, who can raise a ton of money.
5. A lot can happen between now and November 2013.
1. Christie's approval rating is around 55%
Which I believe makes him the most popular governor in recent New Jersey history, and certainly the most-liked current politician in the state.