A major U.S. Postal Service union is launching a national TV ad campaign promoting voting by mail, stepping into a politically charged debate as skepticism about mail-in ballots has been raised by President Donald Trump and others.

The 30-second message features a variety of voters, among them a busy farmer and a flight attendant, explaining why they cast their ballots by mail. Sponsored by the 200,000-member American Postal Workers Union, the advertising campaign announced Tuesday will begin airing this week in Ohio, where Union Army soldiers during the Civil War cast the first mail ballots in 1864. It will then move to other states.

The Associated Press