Experts warn of "homegrown" COVID variants as states expands access to vaccines

States across the U.S. are expanding access to coronavirus vaccines but say the supply still isn't enough. Meanwhile there are growing concerns about the spread of variants, including some first discovered in the United States. CBS News' Carter Evans reports from Los Angeles, and Dr. Eric Coie-Peña joins CBSN's Elaine Quijano to discuss the latest developments.