From 2008, 40 years ago would be 1968. Since then the presidents have been Nixon, Ford, Carter, Reagan, Bush Sr., Clinton, Bush Jr., Obama, Trump and Biden. You can’t count the last 3 since this was 2008 and Obama hadn’t been elected yet. So she means Carter and Clinton.
From 2008, 40 years ago would be 1968. Since then the presidents have been Nixon, Ford, Carter, Reagan, Bush Sr., Clinton, Bush Jr., Obama, Trump and Biden. You can’t count the last 3 since this was 2008 and Obama hadn’t been elected yet. So she means Carter and Clinton.