I don't see him overcoming a 12 point whipping in a Democratic year, even giving him those advantages. Face it, King's pretty much going to hold the seat until retirement, or until the NY Assembly finds a way to redistrict him out of it.
In the last re districting the district was made a bit more Republican. Dems have a new registration advantage and the gap has finally approached what it was prior to the last redistricting.
Something like 1/3 of the electorate still didn't know who Mejias was in late Oct. He runs again he will be more well known than that and have a much closer $$ advantage. Also another Mejias challenge isn't the only one who can be a tough challenge to King. Suozzi would no doubt be a VERY VERY tough battle for King, even with the embarassment of the Gubneatorial Primary. In fact Suzzoi would more than likely beat King. Nassau DA Kathleen Rice could make a run against King as well, and would be a very tough challenge for King.