IF its a landslide this time around (and not just in the presidential race), there will be a lot of soul-searching in the Republican Party. By the time they are an electoral force again they could look very different. 2012 will probably be too soon. But who knows.
I think both parties are in danger of splitting. I'm sure there are manuevers that can be pulled to prevent it, but I would not eliminate it as a possibility.
Please. You're sounding like Angry Weasel. Parties don't split in this day and age.
