The democrat party is being stolen. Many once republican donors are now jumping to the democrat party, and its not just due to Trump, many of these donors don't like the Ted Cruz's, and Mike Lee's either, and these types of republicans are becoming more common with time. To an extent this is a fight between billionaires, the nihilist billionaires like the kochs or grover norquist, vs for example bloomberg. This battle has been coming for a long time, Ever sense Reagan most likely, however the gap between these groups of billionaires was blown wide open with CU. No longer was the mutual compromise between them necessary to fund the republican party, a yet smaller set of people could in fact fuel the most extreme ends of their party.

Any common observer can see plainly that the republican party has been in fact entirely captured, their is not compromise left in the republican party, and in this case I mean compromise between the different nominally republican groups and not the wider political system. The coalition in the republican party is a collection of absolute positions where each group supporting one particular position does not care greatly about the other positions of the party so long as the other groups within the party do not oppose them. The racist Trump supporters don't care about abortion or business issues, their is not enough room left in their extremism to expend energy on such things, they are more in coalition on these issues because they believe the supporters of these issues will not hinder the policies they want, The republican party as it stands now is a collection of non mutually exclusive single issue voters, and a few people that simply picked a team. The nihilist billionaires will come back and support Trump, as generally speaking few of the policies of this new coalition will effect their single issue, business profit no matter the cost.

This new republican coalition excludes a great number of donors, the so called "compassionate" conservatives, really any economically conservative; socially neutral/liberal types, or liberal/moderate republican pro business types. The new Democrat party would absorb these people, under the direction that Clinton is taking, it is very clear that can't fix the republican party, where else are they to go. Its a natural consequence that they end up somewhere, and within the American system that does not support third parties, that means the party they once opposed.

Of course this presupposes, that the new republican coalition isn't a third party, Just because it has been part of the two party system for so long, the current republican party more resembles the know nothings, then a viable party.

And tho it scares me, that a third party would split the vote and hand the reins to the know nothings, it is time, least American politics devolve into a one party system, ran by the most corrupt parts of the Democrat's new coalition built from every moneyed interest Hillary can find.