I sympathize with political campaigns trying to raise money and/or get awareness, but literally every time I've gotten onto a campaign or cause list the volume of emails is unbearable.

A daily cadence is utterly unacceptable. If you're cluttering my inbox daily I don't care what the cause is, I'm unsubscribing. (I'd grant an exception for, like, the 7-10 days before an election.)

Just me? How do campaigns not understand they're turning off their supporters?