Former Presidents Jimmy Carter, Bill Clinton, George W. Bush, Barack Obama and their respective former first ladies are part of a newly released ad campaign urging Americans to get the coronavirus vaccine when it is their turn, a push that is aimed squarely at combating vaccine skepticism.Former Presidents Jimmy Carter, Bill Clinton, George W. Bush, Barack Obama and their respective former first ladies are part of a newly released ad campaign urging Americans to get the coronavirus vaccine when it is their turn, a push that is aimed squarely at combating vaccine skepticism.