One important thing to remember on the polls--O polled better in every state in primaries than actual results.
Yeah, he did have trouble in those primaries - the ones where Clinton had a lot of support. Now that the majority of Clinton supporters will likely vote for his ticket, I doubt that will wane nearly as much. I mean, besides the hysterical flocking of all the single-minded women who will blindly vote for the new woman in town that is a lifetime NRA member and rabid pro-life and her sidekick McCain who voted against the violence against women act and has been against equal pay for women and all.