well, to me it seems as if the conservatives are more of get an idea, run with it, don't let anyone in your way. And democrats try way to hard to please everyone.
As for examples, I'm not sure that jfern is factual, but there's only one clear thing that I can think of that would qualify George W. Bush as a flip-flopper and that is that he said in one of the 2000 debates that he was against the idea of nation building, when it's obvious that Iraq and Afghanistan are clear examples of it. However George Bush does have a clear stance on abortion, social security reform, and tax cuts.
As for the Democrats, you have John Kerry whose relativism made it unclear what his stance on abortion, or what his long term plan for Iraq is.
Republican bullsh**t. Like a large fraction of the population, is personally opposed to abortion, but favors that it be legal, safe, and rare. John Kerry's long term plan for Iraq was to rebuild the country.