Thousands of young Americans sign up to vote during March for Our Lives "Never again" was the rallying cry at this weekend's March for Our Lives, but the thunderous chants of "vote them out" may have the most immediate impact. At least 4,000 young Americans reportedly registered to vote Saturday at gun control rallies across the country. About 4 million Americans will turn 18 this year. CBS News correspondent Adrianna Diaz reports.