You nailed it. Their internal polling must be devastating. And you can bet that their inside information on the state of the economy is probably far worse than what is being made public. Some economists are talking about a decade long recession.
The Dems also know that they are engaging in a suicide pact when they approve ObamaCare. When the public starts feeling the impact, they will be at the Capitol building with pitchforks, torches, tar, and feathers.
If they're lucky that's all it will be.