Vote-by-mail in Oregon

The U.S. state of Oregon established vote-by-mail as the standard mechanism for voting with Ballot Measure 60, a citizen's initiative, in 1998. The measure made Oregon the first state in the United States to conduct its elections exclusively by mail. The measure passed on November 3, 1998, by a margin of 69.4% to 30.6%.

Vote-by-mail had already been implemented to a lesser degree in Oregon:

Measure 60 eliminated restrictions on vote-by-mail and established it as the single form of voting for elections in Oregon. It also required vote-by-mail to be used for biennial primaries and general elections as well as eliminating polling places.

Organizations which supported the initiative included the League of Women Voters of Oregon, the Oregon League of Conservation Voters, AARP of Oregon, and Oregon Education Association. Individuals which supported the measure included then-Governor John Kitzhaber, Oregon Secretary of State Phil Keisling, and former U.S. Senator Mark Hatfield. Supporters of the measure asserted that it would increase voter participation and make elections more convenient for voters. The State of Oregon would also save an estimated $3 million a year, in years which a primary and general election occur.

Notable opposition to the measure included State Representative Lynn Snodgrass and anti-tax activist Bill Sizemore. Opponents claimed the system would invite election fraud as well as the possibility of people pressuring each other in terms of how they vote. Sizemore stated in an online column in April 2003 that the vote-by-mail system "is a formula for election fraud." He also stated that, "Vote by mail is a system designed for honest people. It is predicated on the notion that people are basically good and won’t cheat."

...
Wikipedia