My suspicion is that such a situation wouldn't come about for two reasons: - People's desire to have a defined in and out group would prevent any party that ch

My suspicion is that such a situation wouldn't come about for two reasons: - People's desire to have a defined in and out group would prevent any party that changes coalition by issue from ever existing in the first place - Even if such a party came about, shifts in the local overton window (if that's not an oxymoron) of the Rs or the Ds would push the newly formed Ls away until they wound up effectively a part of the other. They wouldn't even give an advantage to the party they wound up with, they'd just compete for the same naturally occurring 50% of people. On the other hand, I'm in kind of a leftist bubble. I find our typical factiousness endearing most of the time, but it probably skews my view.