There are plenty of them. You can't let the actions of candidates grasping for the support of the crazy base to sway you too far in one direction.
You also shouldn't forget about the electorate as a whole. There are plenty of loonies on both sides, sure. But they don't make up more than maybe 30% of the voting public. The rest are moderate people who vote on one side of the bar or another based on just a few select pet issues.
But just to play along, do you remember how much John McCain was disliked by his base? He's a good example of a moderate who has had two elections stolen from him by his party's failings.
Hell, George Pataki has become a very moderate guy, and he's a Republican Presidential candidate. (Which is why he's getting a solid 1% in the polls...)
Cool based on his personal definition of it - His whole persona, as you've mentioned, has changed to make him more appealing. He just doesn't know when to stop talking, and he doesn't recognize when to let certain personal convictions stay at home. People embellish their personal stories. We all do it. It's not that big of a deal.
This, however, is golden!
Yeah, there are some serious shortcomings in the Republican party. The Tea Party movement was predicted to cause this kind of shakeup in the party and it's coming to fruition. I think the reason that Republicans can do so well in localized elections but not fare so well in national elections is part of that. The vast majority of people in this country aren't psychopaths, but there are very motivated people who are. How far the influence of the crazies reaches into the moderate populace is what's going to determine the outcome of future elections. It's a blight that is devastating the Republican party, sure. But the only way that it's going to affect the liberals is if they overreact and give it more attention than it deserves. Good, old-fashioned, reason and education seem to quell most of it as long as it's applied before it gets out of hand.