It actually started with Sarah Palin.
After she left the stage (and after 3 years of TDS, who knows what threats to her were made behind the scenes), the intensity percolated rather than die down.
So when the Donald threw his hat into the ring, the Leftists were already simmering. It didn’t take much to bring them to their boiling point.
She was great, fought it for a long time, but didn't have the strength that Trump has.
I'm not sure anyone could have survived as he has, considering what was thrown at him. He has a gift, an almost supernatural strength about him.
The Hate started with Reagan or Nixon—and has just grown to a point of irrationality. Many Democrats I have spoken to still believe Russia elected Trump and he is a Russian Agent—proven lie. Some believe Hillary won and was cheated out of the White House. The Media upped Trump because they saw him as the one that could be beaten easy. The “Pussy Tape” was to bury him in one blow. It didn’t work and this amazed the Democrats. Set off the anger. Now they have gone into warp speed to crush him—one way or another. Problem is Trump is without major scandal (or he’s good at covering it up) of note. Going to get worse before November—and, if Trump wins, it will be even crazier. I fear only assassination will be the next step.