Vaccine hesitancy has become the predominant mindset of Americans who have not yet been inoculated, making the drive for herd immunity ever more elusive. Just 11% of American adults who remain unvaccinated for COVID-19 say they definitely will get the shot, while 34% say they definitely won’t, according to a new poll by The Associated Press-NORC Center for Public Affairs Research. Another 27% say they probably will and 27% say they probably won’t. The vaccination rush has slowed, and President Joe Biden met virtually with six governors Tuesday to discuss how to revive momentum. Biden wants 70% of American adults at least partially vaccinated by the Fourth of July. That's about what some experts say is needed to get the pandemic under control. Right now less than half of Americans have received at least one shot.