Romanoff has argued Hickenlooper’s missteps were endangering Democratic efforts to beat Gardner, who is closely aligned with Republican President Donald Trump.
National Democrats rushed to Hickenlooper’s rescue, with outside groups spending more than $2 million on ads in June to shore up his chances. A poll last week showed Hickenlooper with a 30-point lead on Romanoff, easing the worries of some Democrats.
“Hickenlooper was sleepwalking through this campaign so maybe this woke him up,” said Floyd Ciruli, a veteran independent pollster in Colorado.
In Utah, former Governor Jon Huntsman, who ran for the White House in 2012 and served as a U.S. ambassador to China and Russia, is making another bid for the governor’s office in a crowded Republican primary.
In Oklahoma, voters will consider a ballot measure to expand Medicaid, the government healthcare program for the poor and disabled, despite the Republican governor’s arguments the state cannot afford it.
Republicans also will choose challengers to run against U.S. Representatives Kendra Horn of Oklahoma and Ben McAdams of Utah, two endangered Democrats who represent districts that Trump carried in 2016.
(Editing by Colleen Jenkins and Bill Berkrot)