The fact that the measurements we got so far show it matches their previous detonation makes me wonder if it was an H-Bomb, or at least if it was a successful one. Since they have a fission bomb as part of the core, it could just be a failed H-bomb or, as someone else said, an attempt at a tritium enriched bomb.

As far as U.S. presidential politics goes, meh, it's 10 months from the election, we don't even know who the candidates will be for either (especially the GOP), and the only people who should be sweating are S. Korea and Japan.