I can't believe you guys grossly underestimate Trump so much. You seem to all assume Hillary will beat Trump - perhaps even by a landslide.
Remember when everyone said
"No way Trump is serious about running for president it's just a publicity stunt", and then later
"No way Trump will sustain his high poll numbers it will all collapse eventually like all joke candidates before him" and then
"No way Trump is coming back after losing Iowa. The so called "winner" is already a loser LOL" and then
"Trump is finished now after flirting with the KKK".
The list goes on and on... You could also mention the muslim ban or insulting John McCain. The normal rules of politics just don't seem work on Drumpf.
As an outsider not from the USA, with a degree in Political Science, Trump seems like the typical charismatic Right-wing populist combined with
an unique skill to dominated the news cycle. Remember Trump has been in show business for decades now and understands how the media works better than any politician.
Clever democrats are not underestimating Trump and neither should you:
http://www.politico.com/story/2016/03/democrats-on-donald-trump-threat-220118
Trump is a master at framing his opponent when he really wants to. "Low energy Jeb", "Little Marco", "Lyin Ted" etc. He will relentlessly go after Hillary with some childish nickname which will eventually stick.
In my life, besides Putin, I have never seen a more Machiavellian politician than Trump. I also think the rumours, that Trump learned about public speaking by keeping a collection of Hitler speeches by his bedside, are true.
There is still a long time until the General election. Most voters in the country are not paying attention right now or have a short memory and will have forgotten Trumps scandals by November. Of course democrats will do everything to remind voters of the KKK stuff etc. The truth is there still is plenty of time for him to pivot towards the General Election. Sure Trump has burned his bridges with liberals, but there still is plenty of time to mend the fences with moderates and conservatives sceptical of him.
I suspects it is correct when Trump claims he can put Rust-belt states like Michigan and Minnesota in play and increase turnout among white voters. I would not be surprised if Trump dramatically boost turnout with Republican leaning White working class voters. This is a group which has been drifting gradually away from the Democrats during Obama.
Will minorities rally around the Dems to stop Trump? Maybe. Will highly educated voters flee the vague promises of Trump towards the technocratic Clinton? It certainly is possible.
In my estimation there is at least a 30-40 % chance Trump defeats Hillary in a general election match up. Any one that thinks this will be a walk in the park victory is a bit of a fool imo. There only way democrats can win in the fall is if they start mobilizing all the passion and urgency they mustered in 2008.
Right now I'm not sure they are up to the task.