I was thinking upsets from the two party status quo. It reduces spoiler effects but increases the risk of that third-party candidate actually winning, and I thi

I was thinking upsets from the two party status quo. It reduces spoiler effects but increases the risk of that third-party candidate actually winning, and I think the two national parties are worried about needing to change at the regional level in ways which they fear would harm their party in other regions (e.g. say more AOCs beat establishment Democrats in similar district: do they get comfortable with a two party coalition, or do they try to run more liberal Democrats and hope this doesn’t set them further back in other states?).