John Hickenlooper, governor of Colorado, waves while arriving on stage during the Democratic National Convention (DNC) in Philadelphia, Pennsylvania, U.S., on Thursday, July 28, 2016. Division among Democrats has been overcome through speeches from two presidents, another first lady and a vice-president, who raised the stakes for their candidate by warning that her opponent posed an unprecedented threat to American diplomacy. Photographer: David Paul Morris/Bloomberg via Getty Images

John Hickenlooper, governor of Colorado, waves while arriving on stage during the Democratic National Convention (DNC) in Philadelphia, Pennsylvania, U.S., on Thursday, July 28, 2016. Division among Democrats has been overcome through speeches from two presidents, another first lady and a vice-president, who raised the stakes for their candidate by warning that her opponent posed an unprecedented threat to American diplomacy. Photographer: David Paul Morris/Bloomberg via Getty Images