Zero targeting. Why would the message change based on the audience? I can't see any legitimate use case.

i would say age, gender, location, and leave it at that!

maybe not gender actually, now I think of it, and maybe not age or location either.

force them to just broadcast the same message to everyone, and that's it.

Yeah I've been going back and forth on this. I think some location targeting is important though. For example, if you're running for mayor I don't think you should have to advertise to the whole state or country. I think the real question is should you be able to sub-target the voting populace? (i.e. I'm running for a statewide race but only want to advertise to certain cities)

If you’re up for election in region X, then your ads should have to be shown to everyone in region X.

Why age and gender?

Those are super easily (and frequently) exploited.

I initially wrote that because it seemed like the kind of thing that has historically be targetable, before online advertising - eg. by buying space in a particular magazine more prevalently read by that age group or gender. BUT I immediately took it back with another comment. I think the difference is that while you could target those specific groups back then, you still had to take out an ad that _could_ be seen by everyone else.