I suspect that he won't be charged non-the less convicted until after the mid term elections. That said, it doesn't matter if he pardons himself, because congress will likely impeach him if he is convicted or even just indicted.
He probably could. I don't think there's anything that prevents a successfully impeached person from holding office again. It just removes them from office and requires reappointment or reelection. But I think he'd lose the popular vote again and probably the EC since enough people would've finally wised up (or just lost the momentum).