Actually gun control will probably be a platform of HRC - which will backfire, and she'll backpedal, like she always does when the polls determine a new shade of HRC is required. This recent backpedaling is classic Clinton:
http://www.people.com/article/hillary-clinton-apologizes-coal-miner
The email server actually is an issue as well, in spite of the attempts to minimize that she generated, stored and sent classified information on an unsecured system. I would not be surprised for this to continue to be a problem for her, even after the election.
As much of a loudmouth blowhard and bullshitter as Trump is, he doesn't haven't nearly the problems in his past that she does. I suspect Trump is either going to burn out spectacularly, or actually win this election.
On the DNC front, I do admire our little socialist from VT for sticking with it. The people in this state know he is a man of his word. He has tremendous support here.