AH Challenge: Another "Critical" election

[Mister Abbadon]

A couple of Political Scientists said we were due for an election where a majority of the supporters for one party switch or the current parties are replaced by others since 1968
Your mission, should you choose to accept it, is to cause an election like this to happen anywere from 1968 to 2008.

 

[FDW]

A couple of Political Scientists said we were due for an election where a majority of the supporters for one party switch or the current parties are replaced by others since 1968
Your mission, should you choose to accept it, is to cause an election like this to happen anywere from 1968 to 2008.

In one of the works I'm working on I have this going on, mind you, it has a POD in the early 20th Century and the shift is incomplete as of 2008.