“What is the GOP prepared to do about it?”
They are willing to do NOTHING, they the Tea Party as much as the left does, and have known of this mess for quite some time now.
My guess is you left out the word "hate" from that sentence, as in "they HATE the Tea Party as much as the left does."
For most in the GOP Washington establishment, that's true, but there are a few Republicans who are exceptions to the rule.