Former Presidents Barack Obama, George W. Bush, Bill Clinton and Jimmy Carter feature in national ad campaigns launched Thursday in a bid to boost shaky public confidence in Covid-19 vaccines, which has been undermined by speedy development and months of politicization—Donald Trump, who was vaccinated in secret after previously claiming he was “immune” to the virus and takes credit for the vaccines’ development, was the only living former president not to participate. READ MORE: https://www.forbes.com/sites/roberthart/2021/03/11/trump-absent-as-all-living-former-presidents-come-together-for-covid-19-vaccination-campaign/?sh=4b8b3de2215f Stay Connected Forbes on Facebook: http://fb.com/forbes Forbes Video on Twitter: http://www.twitter.com/forbes Forbes Video on Instagram: http://instagram.com/forbes More From Forbes: http://forbes.com