According to the GW Law website, once admitted part time, one can transfer in the fall into the day division with the "permission of the Dean." After the first semester, one takes a full time course load at night and then a 4 credit class in the summer and then one is in the full time division.
It would seem that one has to register for the spring semester well before fall grades are in (so that the transfer is not grade dependent) and wouldn't one infer that is a virtual automatic transfer into the day division?
If one has marginal stats (e.g. 164/ 3.3), this seems like even an easier path to a top 25 day time program than the path at Fordham Law.