Tamara Keith The Biden administration is moving into a new phase of its campaign to vaccinate as many Americans as possible for the coronavirus, one where the government may not always be the best messenger to persuade people to get their shot. So it's working to bring together hundreds of local and national groups into something it calls the COVID-19 Community Corps, enlisting people to help their friends, family and neighbors make appointments and get access to vaccines. On a recent evening, Surgeon General Vivek Murthy led a Zoom call for people who have signed up to help. "I just want to remind you again, which we will keep doing again and again and again, that this is not just a government-driven effort," he said.