Civil War II will start once people get any more steamed than they already are. It will likely start at the ballot box with third parties gaining more steam than they already have.
If the old adage of "As goes California, so goes the nation" is true, then all is lost already and we may as well chuck it in, load up on dried beans and shotgun shells and just try to survive the coming quake.
IMO, the key to anything is communication using very small words. Bush is not doing well with this as he stays away from press conferences, no matter how well controlled they are.
Newt had the right idea when he published the Contract With America and showed a roadmap. It was very easy to understand.
Even Ross Perot with his charts had the communications thing down -- even if you needed a PhD in statistics, he showed that he was willing to communicate.
If the Republican Party wishes to keep its base and avoid defections, it had better get its communications apparatus started and begin addressing issues like illegal immigration and massive entitlements.
Elsewise, third parties will hoover up the disgruntled and the Dims will simply always be there.
Note that the Green Party is hoovering up the disgruntled wacky-leftie Dims.