What do you expect Democrats to do? Specifically.
They and the Republicans have been crying wolf for so long and so many times. The Democrats have marked the Republicans as their equals by doing so. I've worked in offices and in construction, and the outcry against the Republicans and Democrats never ceased, day after day. It was nothing but sickening like having to eat oatmeal constantly. Meanwhile both parties conspired against voters.
Prove they are serious about their concerns about Trump by:
1. Identifying which voters they need to win over from the Republicans which will definitely get them a win in November, and pursuing them instead of pursuing the good graces of Europe. They already pander to the corporations, so this is not above them. They can do it.
2. Announcing a change in policy for this purpose: saving the country from destruction. I keep hearing it, but I don't see anybody actually behaving like its true.
3. Make it a major policy change on something such as: Gun Control, Gay Rights, Pro Choice, Immigration. A switch to Pro Life would win voters.
4. Either that are stop the ceaseless claims that the Republicans are destroying the country, that the situation is so bad that if I don't vote Democrat that the world will go up in flames. Let the Democrat party put up or shut up. Then they can challenge the Republicans to do the same. The Republicans won't, and the Democrats will win and save the country from eminent destruction.
5. Republicans also should do this, but they aren't the ones about to lose this election.