> normal circumstances main-in is for deployed troops and citizens living overseas, who normally are a small minority. There are lots of other valid reasons t

> normal circumstances main-in is for deployed troops and citizens living overseas, who normally are a small minority. There are lots of other valid reasons to vote by mail. In fact, living abroad is only a valid reason in a minority of states. Depending on what state you last lived in before moving abroad, you may not be able to legally vote at all. All states let you vote by mail if you are going to be traveling out of your polling district for the entirety time the polls are open on Election Day, or are sick and cannot go in-person. But some states let you vote by mail without a specific reason, and a few states run all elections by mail.