Midterms impact on Christie's chances at the nomination?

[Mister Mets]

The major benchmark is to have no net losses (It's okay for him if Republicans lose Pennsylvania, Maine and Florida, if they gain Massachusetts, Arkansas and Illinois.)

He could always blame incumbents for losing, although that's an argument that's better to avoid.

It's also going to be important for him that financial disclosures in Wisconsin indicate sufficient support for Walker.

[Mister Mets]

Yesterday was his best day since reelection.

Republican gains were impressive, with fewer than expected losing incumbents, and some surprise wins (Maryland!)

Walker won reelection nicely, so Christie could avoid any claims of sabotaging Walker's campaign by arguing the money was needed more in Florida, Massachusetts and Illinois.

Two potential opponents, Walker and Kasich, can point to their own reelections as proof of their own electability, but it takes a bit more than that to become a top-tier contender.