Blindsided? I think not. This bill has been part of the public record for three years now. They knew this was coming. They alone are responsible for their own ignorance of the most rudimentary of economic principles.
Maybe, but probably not.
They were all wrapped up in their self-righteous advocacy for "helping the needy get healthcare". They didn't look at it beyond how they felt about themselves for supporting it.
And, as an added bonus, they got to consider themselves morally superior to those "racists" who only opposed it because of Obama's skin color.