Why Liberals Hate the Constitution

After the hysterical way liberals reacted to the reading of the Constitution by Republicans to open Congress, with Democrats objecting to it, left-wing newspaper editorials denouncing it, and liberals online freaking out over it, no reasonable person would argue that liberals don’t hate the Constitution, but the reasons why aren't as obvious. So the question becomes, why do liberals hate the Constitution so much -- especially when it's the only thing protecting them from freezing to death with pickaxes in their hands?