Keith Judd, a federal inmate convicted of extortion, captured 42 percent of the vote in Tuesday's primary. According to Democratic National Committee rules, the prisoner could qualify to assign at least one delegate to the national convention in Charlotte, N.C., this September.

Romney went on to note that polls showed more than 90 percent of Republicans were willing to vote for him, and said, with regard to the Obama administration, "people are recognizing it's been a disappointment."

President Obama also regularly polls above 90 percent among Democratic voters, although he has struggled in West Virginia, where conservative social politics and the dominant coal mining industry have made gaining traction difficult. Earlier this year, Gov. Earl Ray Tombin and U.S. Sen. Joe ManchinJoseph (Joe) ManchinWashington VIPs gather to celebrate Mark Penn's new book Overnight Defense: Senate sides with Trump on military role in Yemen | Dem vets push for new war authorization on Iraq anniversary | General says time isn't 'right' for space corps Senate sides with Trump on providing Saudi military support MORE — both Democrats — said they weren't sure whether they would vote for the president in November.