U.S. launches ambitious vaccine plan as new COVID-19 strains spread

U.S. President Joe Biden is pushing on with his plan to get 100 million Americans inoculated for COVID-19 during his first 100 days in office. But several states say their vaccine supply is dwindling, and there aren't enough sites to administer them. Jennifer Johnson looks at the race against time, amid the threat of new and more contagious strains of the virus.