This is an aside from the immediate drama of impeachment but Murkowski could be a fascinating template for how the two party system might start to break down (it's all about the structures, not ideology or policy or personalities).https://twitter.com/igorbobic/status/1354128481756573696 …
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Romney & Collins are in the same position. Brown in Ohio might be another good example. The AK reforms would benefit all of them immensely and open similar territory in other states.
I'll concede that maybe collins has enough genuine grassroot support to win as a write in... After all maine already has RCV and she still won. But I think if you pitch an independent Romney head to head against a generic republican mormon in Utah he would lose badly