Fact-checking the controversy over the USPS voting mailer

The rules for voting by mail throughout the United States cannot be squeezed onto a postcard. The U.S. Postal Service just learned that the hard way.

The Postal Service mailed out a postcard across the country with tips for voting by mail. The tips, however, have drawn bipartisan criticism because some are wrong for particular states.

The postcard urges voters who plan to vote by mail to request their mail-in or absentee ballot at least 15 days before Election Day. It tells voters to "mail your ballot at least 7...