Two Democratic super PACs are launching a $7.5 million advertising campaign to encourage voters to request mail-in ballots in several states crucial to their party's hopes of winning the White House and flipping control of the Senate./Credit:	MANDEL NGAN/AFP/AFP via Getty Images

Two Democratic super PACs are launching a $7.5 million advertising campaign to encourage voters to request mail-in ballots in several states crucial to their party's hopes of winning the White House and flipping control of the Senate./Credit: MANDEL NGAN/AFP/AFP via Getty Images

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Democratic groups launch $7.5 million campaign to encourage voting by mail

Two Democratic super PACs are launching a $7.5 million advertising campaign on Monday to encourage voters to request mail-in ballots in several states crucial to their party's hopes of winning the White House and flipping control of the Senate.