I've maintained for some time that while most spam is commercial, whether something is spam is not dependent on it being commercial. Charity spam, religious spam and political spam are just as bothersome as Viagra spam.
However, fellow EFFer Larry Lessig challenged me on this by asking whether we might want to allow political spam. Spam is super-cheap to send (that's one reason it's a problem) but as a very cheap form of advertising it could be an equalizer when it comes to campaign expenses, since a candidate would low-funding could spam almost as well as one with boatloads of special interest money. That's unlike TV advertising, where the better funded candidate wins the game.
I have to admit that the current way elections are funded and political influence is bought and sold is a much more important problem than spam, so this is a question worth looking at.
Of course, it would be stupid for a politician to spam, even though they have exempted themselves from the spam laws. Spam generates such ill will (appropriately too) that I think a spam campaign from a candidate would backfire. Plus, I really don't like the idea of regulating spam based on what it says -- If it says one thing it's banned, if it says another it's OK.
But is there a germ of something worthwhile in here? What if the election officials managed the mailing list and voters had to be on it, for example.