This is the same problem the Republicans have, or had. Remember how many said that if McCain got the nomination they would vote for Hillary instead? I believe Ann Coulter is one of them now that I think back a few weeks. Of course today you don't hear much from that crowd and I highly suspect the same thing will happen in the Democratic camp over time.It's the childish if I can't have it my way, I'll take my ball and go home syndrome. They are ranting their displeasure in the hopes that momma will kiss it and make it feel good, but in the long run they'll come around.
I personally expect a hard fought battle this November and we will be lucky (I think) to hold onto the executive branch.