Okay, I just looked through all the MALO stuff for WP to figure out the coding - this is obviously for WP, but I think there would be similar codes for each of them.
In our state there are 8 districts. For someone receiving a congressman's nomination, the coding would be the state, followed by the first two digits of the district, followed by the slot (of the 5 that the congressman has that they are competing for). So if you were in district one, yours could say WI013 or WI015. I found both of those from the class of 2014 so that congressman must have two slots available this year (#'s 3 and 5, out of the total 5 that he can have there at one time). This may show up differently on the actual candidates website as just the WI01 (since you don't really care what slot it is), or it may differ by academy.
The senators in our state both start with 6 though. One senator's nominations come up as WI61 and the other WI62 - again followed by which slot of theirs it is that's vacant - for this year, evidently WI623 and WI612. But again, you may only see the first two digits, so for your state it would be NJ61 or NJ62, depending on which senator it is.
But yes, it sounds like a senator nom! Congrats! Hope this helps some!