Trump/Christie .NJ goes red, bye be Hillary.
You like Christie?
I fear that if people are hesitant about voting for Trump in the general election then having Christy as a running mate would most definitely scare them off.
Trumpies are certifiable. Christie's latest approval rating in New Jersey shows him at 33 percent favorable, 59 percent unfavorable.
http://www.politico.com/story/2015/12/chris-christie-approval-rating-new-jersey-216654
Trump's approval rating in New Jersey is even lower than Christie's - 31 percent favorable, 57 percent unfavorable.
http://politickernj.com/2016/02/rutgers-poll-new-jersey-republican-voters-favor-trump-for-prez/
Trump has less than a 0% chance of carrying New York or New Jersey. Unless he goes full-on liberal and changes those few positions where he differs from Bernie Sanders. Then he might have a shot.