**My first thought, if they’re keeping it quiet it must be a dem, **
Me too.
I don’t necessarily agree with your Republican thesis, however.
The more I think about it the more I think it probably is a pubbie for just the reasons I stated. If this particular candidate becomes the pubbie nominee they will release the info to sink him if he doesn’t become the nominee they can say it doesn’t matter. They will protect Hillary no matter what.