Trump got 9 percent of dem vote bush got 7 percent
Not that much big of a difference. Also, Trump lost a ton of Romney/suburban GOP voters.
And about DU, the DU literally shut down due to intense panic on election night. They tried to claim a Trump troll "hacked them" but I doubt that because right after this "hack" they said you could go on the forums if you were a premium member - but who the hell would give their credit card info to a website that was just hacked?
Trump's performance on election night put the DU in total shock.
As mentioned, 2004 was a lot closer (Bush led most of the polls in both swing states and PV) and Democrats were demoralized, but not outright shook.
2016 put them into total shock of incredible portions. 2004 was them seeing their pet die; 2016 was seeing a parent die.