Sometimes you have to play very smart and sacrifice. The GOP needs to be blameless in these next four years.
So you know what? Leave the blame on the Dems. Let them have it the way they want it. The GOP will not win the PR war with the Dems on this issue if they fight to not raise taxes on the wealthy. The Democrats have this planned out already and know that they will win the issue with the popular support. They are ready to blame Republicans, which will hurt the Republican candidates in 2014 and 2016.
Be smart. Yes, I want the party to fight the liberals, but I also want the party to win and regain power as well. They want to play? Ok. Let's play their game. They want x, y, z? Fine. It will fail and the Dems will be blamed for it.