Your link is to a discussion of the cliff itself.
My observation is that this week's bill raise taxes four time as much in red states as it does in blue states for $250,000 through $450,000 earners.
That should be read as Republicans getting hit four times as hard as Democrats.
The reason is higher state income taxes and property taxes in blue states. Blue state residents are already subject to high AMT, while this bill captures the red staters who escape the AMT.
look at the post in particular. it’s a table showing the percent increase by income level.. just due to the new tax levels