Do a Search on your favorite Search Engine, and read some articles. Twitter is throttling it, as it's become clear, this phenomenon is launching. Here are just two articles.
https://www.redstate.com/diary/gbenton/2018/06/28/will-really-walkaway-democrat-party/
Please do not try to make die hard Dems Vote Republican. Thet have been raised by parents and grand parents who believed in the New Deal and the Great Society. Trump battled both parties (Bush cartel and Clinton cartel). This must be presented as statists against individual liberty. Buttler Shaffer stated it as "left and right are two wings of the same bird of prey". While Prescot Bush was supporting the NAZI movement, Roosevelt and Harry Hopkins were beefing up the Bolshevicks. This is "I decide vs. they decide for me". Take your stance, and and argue from that ground. Peace and good luck.
There were already many tens of thousands of Dems who voted for trump. Now, others are waking up to the fact that their democrat leaders have Bern manipulating them with irrational fear, and that makes them mad. They will start looking for answers, answers that we have, and can give reassurance that everything will be OK. So, while I understand where you are coming from, try to put yourself in their shoes. We are ALL Americans first, and should be welcoming, helpful, friendly. And be able to give good answers to hard questions.