> Presumably by some kind of voter identification? Like the way most countries do it.

Ok, sure, just find a way to implement that which doesn't allow it to be abused disenfranchise voters, which is what typically happens here in the states.

> You could have multi-day polling too, that's fine. I don't understand why this is so hard in this country.

Yep, you could. No politician suggests this for some reason.

> No I can't because I live in Oregon, which despite being a high tax state, is unable to conduct even the most basic election.

Sounds like your problem is less with the concept of mail-in ballots and more with the fact that your state can't handle running a polling location.

> It's not when we have an easy answer to this problem -- have a physical place to vote.

For all the reasons I already outlined, it is not actually an easy answer.

> Why aren't these 'voter suppression' tactics used in liberal states not up to questioning?

They are. If no one is talking about it then they should make a bigger stink about it.