Bob Dole
In 2015, Dole supported former Florida governor Jeb Bush in his presidential campaign. After Bush ended his campaign following the South Carolina primary, Dole supported Florida senator Marco Rubio's campaign. During the campaign, Dole criticized Texas senator Ted Cruz, saying he would not win an election. Dole later supported Donald Trump after Trump won the Republican nomination. He was the only former Republican presidential nominee to go to the 2016 Republican National Convention.