If you mean the Tea Party/hard right, no they are not doing well, but are nto dead, as they still have the House and manage to pose a threat.
If you mean the whole GOP, yes, they have tarnished, BUT, sadly, they have pulled so many Democrats into their orbit that withing the party, we have a de facto wing of the GOP. The Faux "Centrists" are doing just fine thank you, especially as the Obama/Clinton side of the party seems to be more concerned about trying to win their minds over than to champion those of us who, well, WON THE ELECTION. It's one thing to try and mend the country; but , as every house with an addict knows, there are time to need to break the bottles, flush the pills, and say "It's either jail or Rehab!"
People can debate about whether Obama is just being cynical, or genuinely thinks that this time, he can knock some sense into these fools, but in the end, it does not matter much. An addict that keeps getting a supply has no reason to change, at all, and, at the risk of making the worst pun ever on DU, the Koch brothers are willing to keep shoveling Coke to the even the biggest, smelliest, ugliest, loudest crackheads in the House and the Media.
I do not excuse Spitzer, Edwards, Weiner, Bill Clinton, or any of the other idiots on our side that somehow thought they could screw around and NOT have someone get evidence. If you live in a fishbowl, chances are people will see you when you do not want them to. However, to show how much the GOP is "losing" note how much GOP types get caught, and have ZERO hindrance to their political career. That is because the GOP get rewarded for bad behavior, and until that changes, we have no right to shoot fireworks and go "ding dong the witch is dead."