Is Chris Christie running for president in 2016? Is the sky blue? Does the sun rise in the west and set in the east?
Christie is probably the closest thing there is a sure bet to a presidential contender as there is. With a potential second term as governor of New Jersey ending shortly after the 2016 elections, Christie will have no where else to realistically go if he plans on staying in politics. And if he manages to stay relatively popular across the board, he won't squander the chance by waiting around for 2020 or, should a Republican win, 2024. So chances are, Christie will run.
"Most Electable"
Electability always plays a role into presidential contests. While many conservatives were not supportive of a Romney run in 2016, he was probably the most electable in the field that chose to run. (Personally speaking, he finished the campaign as probably the most impressive candidate to have ever lost the presidency.) And that electability perception factored into his eventual victory. Christie will play many of the same cards. He is the governor of a blue state. Unlike Romney, he might actually be elected twice.
He has high levels of support with Democrats and Independents (though he dips with Republicans compared to others). And not just average favorables with Democrats and Independents. But really, really good favorables.
Early polls (or really, really, really early polls if your prefer) show Christie in a statistical tie with Hillary Clinton, the most likely Democratic nominee if she runs. And he is well ahead of VP Joe Biden early on. So, right now Christie is viewed as the most electable. As the only blue state governor on the list of nominees, his argument as electable would be convincing. And unlike Mitt Romney, Christie is actually popular with his voters and could potentially carry his home state.