Oh man, you have to google the whole Sad Puppies/Rabid Puppies wank, it's glorious. Basically, each group came up with their own slate of writers they felt were deserving of a Hugo nomination but had somehow been ignored even though the Hugos are done by popular vote. There was/is a strong agenda of "let's get back at the SJWs!" and "let's nominate 'real' sci-fi like in the good old days!" with Larry Correia convinced that the only reason he lost a Hugo was because he was a religious conservative and not because people voted for a book they liked better than his.

The Sad Puppies claim to be reasonable and not crazy bigots, but they pretty much owe their momentum to the Rabid Puppies, helmed by Theodore Beale aka Vox Day, a crazy racist bigot who thinks women shouldn't have the vote. Beale actually invited GamerGate types to buy WorldCon memberships and vote in his slate picks, and apparently enough of them did. John C. Wright in particular made out like a bandit.

It's not settled yet, it just got them on the ballot. The vote has yet to go down and lots of fans are very angry they've gamed the system this way.