Former Presidents Bill Clinton (left) and George Bush discuss their lives as current and former presidents at a leadership event at the George W. Bush Presidential Center in Dallas on Thursday.
Former President Bill Clinton gestures to the crowd during a campaign stop in Philadelphia for his wife, Hillary, on the day before the 2016 presidential election.
Nicholas Kamm/AFP/Getty Images
Former President Bill Clinton plays with balloons onstage at the end of the fourth day of the Democratic National Convention at the Wells Fargo Center in Philadelphia in July.
Aaron P. Bernstein/Getty Images
Democratic presidential nominee Hillary Clinton takes the stage at the Democratic National Convention in Philadelphia Wednesday night following President Obama's speech.
Bill Clark/CQ-Roll Call Group via Getty Images