DENVER—Sen. John Hickenlooper (D-Colo.) has swept aside a progressive challenger in Colorado’s June 30 Democratic primary and will seek a second six-year Senate term in November against a Republican state lawmaker who did not face a primary to earn the GOP’s November berth. Hickenlooper, a former two-term Colorado governor, had garnered around 322,000 votes for 57.3 percent of the tally when he was declared the winner at 9:36 p.m. ET by The Associated Press in his primary race against liberal state Sen. Julie Gonzales. He will face aerospace engineer Mark Baisley, a state legislator since 2018, in November’s general election as a prohibitive favorite. A Republican hasn’t won a statewide election in Colorado since 2016....