Can't say for certain that 47N will be open during this year's Presidential TFRs, but it was open with last year's configuration and I expect it will be open this year, too. It is just outside (south) of the inner, 10 mile ring. You have to be talking to ATC, on a squawk code, be cleared into the 30 mile ring, and have a flight plan on-file (didn't need to be activated last year). But going through the Bravo will provide the first three items, so only need to add the flight plan filing.
Only other difference is that 47N is so close to the edge of the 10 mile ring that during the TFR its runway 07 pattern is changed to right traffic from its normal left traffic to keep airplanes south of the runway and away from the 10 mile ring.