You have to understand that Trump scares the left as well. Despite GayRod's comments, he is worried about Trump for the simple reason that they really aren't sure what they would get with Trump. They know what they get with the current crop of GOP establishment types. They have the Washington Generals. That is also why the hate Cruz. Cruz actually opposes liberalism. The current crop of Republican Failure Theatre offers token opposition, while always giving the democrat party their way.
Trump scares me less than Cruz or Rubio.