U.S. expats prepare for 'most important election of their lives'

Ahead of a U.S. presidential election that will rely more than ever on mail-in voting -- and the controversies surrounding that -- U.S. citizens living abroad see the practice as nothing new.

Ahead of a U.S. presidential election that will rely more than ever on mail-in voting -- and the controversies surrounding that -- U.S. citizens living abroa...

It's how they've always cast ballots. But many expats living in Mexico are particularly energized this year and determined not to have their voices left out.