Demorats are looking for one of two possible outcomes, either of which will suit their purposes:
1. Republicans stand up and try to fight against tax increases, in which case they get hammered as obstructionists.
2. Republicans go along with tax increases, in which case they get hammered as co-conspirators (the bi-partisan krapp) or even as the instigators. When they control the message the way they do today, anything will fly, including forgetting later about any part the demorats had in the tax increase.
We can't win. Furthermore, the GD sheeple DID vote for a tax increase. They think it will only be on the rich, but you can't fix stupidity. Give it to the demorats. Anything they want. But vote 'present.' Force them to own it.