Colorado Gov. John Hickenlooper has created a leadership political action committee, a sign he is interested in exploring a 2020 presidential run and raising funds to pay for travel and other campaign-like expenses such as polling. The two-term Democrat will be out of office in January due to term limits. He has long been on media lists of potential presidential contenders, behind politicians with more national recognition such as Sens. Kamala Harris, Elizabeth Warren, and Bernie Sanders, as well as former vice president Joe Biden. Hickenlooper has so far demurred or sidestepped questions about whether he will run. In August...