What happens when one party in a stable two-party political system starts to collapse? The most immediate effect is alienation. At first, as the party elite grows ever farther from the base in thinking and interests, a large faction of the base expresses its objections by staying home on election days. The difference in turnout hands the election to the opposition. An even larger share of the party base becomes alienated as a result of the defeats. Future losses at the polls are virtually guaranteed because people who don’t think their team can win start looking for a new voice. Contributions to the old party start to diminish as people put their political investment elsewhere or nowhere.
Go ahead, RTWT, I'll wait.
Then I read this, which lead me to this: