Seattle

That seems like an easy fix though as long as people can visit a single website or get a brochure in the mail listing who all the candidates are.

I don't know about Oregon, but we already do this in Washington. We are 100% mail-in elections, and when your ballot comes in the mail, you also get a voter's pamphlet with information on all the measures and candidates. Or at least all the ones that bother to submit information. A few election cycles back, the Republican nominee for governor missed the deadline to submit a statement form, so the pamphlets mailed out to voters had a blank page for him. The campaign blamed it on a fault with their email server, but based on the level of competence in their campaign overall, I suspect someone just fucked up.

All that said, you can lead a horse to water... but you can't make a voter educate themselves. There are still plenty of people who don't bother to read the voter's pamphlets.