Collusion to influence an election is treason. Ok. Why do you not care that the DNC colluded and did sway the election?
The DNC alone colluded to oust Bernie and ensure Hillary in the primary. That likely cost the Dems the White House. That is a rigged election. I may hate Bernie, but his supporters have every right to be pissed that the primaries were rigged.
Actually, who a party supports and how they decide is up to the party. There is nothing in the constitution about political parties at all. In fact, this was intentional, as the founders were strongly opposed to having political parties. There wasn't a primary election until 1901 and to this day 20% of the states have the party bosses decide for their state. I think the Republicans would have been better off in the long run to just deny Trump the nomination as soon as the video of him bragging about assaulting women came out. I think a little morality and principle would have served them better in the long run.
I disagree with the DNC backing Hillary. It was not illegal. It was against party rules. People should be mad. I think it is part of what cost them the election. Trump won by trivial numbers 77,000 voters in the right places would have put Hillary in.
But it is not the same as conspiring with Russia against the United States. Conspiring to receive stolen information. Receiving foreign money. Offering to set policy based on bribes. Offering to sell classified information. Money laundering. Tax evasion. Lying to congress. Lying to the FBI. Lying on security forms. Forgery. Perjury. Failing to register as a foreign agent. Obstructing justice. Those are crimes. And some have already plead.