I believe strong evidence of this would be how politicians spend the majority of their time and money campaigning in a few swing states. In strong left or right-leaning states, that majority of voters is taken for granted.
If the opposite is true we would expect to observe two parties with very different views and tending to drift further and further away from each other to capture the extreme voters.
Do you have evidence this is true? I have not seen it in recent US elections.
I believe strong evidence of this would be how politicians spend the majority of their time and money campaigning in a few swing states. In strong left or right-leaning states, that majority of voters is taken for granted.
If the opposite is true we would expect to observe two parties with very different views and tending to drift further and further away from each other to capture the extreme voters.