You mentioned two bits of information in your previous comment that need to be addressed:

1) A better comparison should be the 2022 Senate Race where Senator Peter Welch by roughly 68% points in the open race. This means Sanders got at least 5%+ points less than Welch did, even while 2024 is the presidential election year. Welch actually did 2% points higher than Biden did in 2020.

However, Sanders likely got the drop in margin of victory vs his previous Senate elections because of the national environment, not as much any underlying issues he had as an incumbent Senator. A tiny margin of difference between Sanders and Harris doesn’t particularly suggest anything other than the national environment impacted Sanders’ margin of victory a bit.

2) Harris was perceived to be arrogant by the Teamster’s President, which pretty much is in the same boat of being elitist. There is no data I have seen as of yet (unless anyone wants to share) that Sanders had issues with working class voters, at least in VT. VT is not a rust belt state although I am not too familiar with its blue collar sector.

It is possible Sanders by association with Harris and the Democratic Party did see a drop in enthusiasm in his Senate race. However, this is a 5+% point swing away from Democrats, which isn’t in my view something to be too concerned about.

If Sanders won re-election by 20% or less, then I’d be concerned.