3/16: Vaccine testing expanded to include young children. Heartbreaking stories from border-crossing families.

Moderna says it has already given the first doses of its vaccine to kids from six months to 12 years old. Another vaccine that has not yet been approved in the United States is running into trouble in other countries. CBS News is getting a first-hand look at the unfolding crisis at the U.S.-Mexico border. President Biden is traveling today to highlight the benefits of his massive COVID economic relief plan, which will start putting money into people's pockets very soon. We're hearing from an Oklahoma girls basketball team that was called the n-word by a sports announcer.

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