Republicans have their sights set on the West Virginia Senate race, believing they can unseat Democrat Joe Manchin.
President Donald Trump tweeted on Monday that Blakenship can not win the general election on Tuesday and suggested that West Virginians should either vote for Morrisey or the establishment-backed Rep. Evan Jenkins (R-WV). "Remember Alabama", the president said.
Mr Moore, a former Alabama Supreme Court judge, crashed out of the race, handing Democrats their first Senate victory in the Deep South state since 1992.
West Virginia GOP Senate candidate Don Blankenship had defended his use of the term "Chinaperson" and continued to use "China people" in a new campaign video.
Blankenship later responded to Trump's tweet, saying: "No one, and I mean no one, will tell us how to vote". Blankenship is a former CEO of Massey Energy who until recently was serving a yearlong sentence for a misdemeanor conviction over his involvement in the deadliest United States mine explosion in four decades.
Morrisey said the Republican candidate nominated in West Virginia could determine control of the U.S. Senate. "We need to win in November".
"The President is a very busy man and he doesn't know me and he doesn't know how flawed my two main opponents are in this primary ..."
"I want to make sure (U.S. Senate Minority Leader) Chuck Schumer (D-N.Y.) is not the majority leader". Luther Strange in the primary because he knew Moore couldn't win.
Blankenship has billed himself as an anti-establishment Republican in the vein of the unorthodox president, embracing the label that he is "Trumpier than Trump".
Trump's run was also defined by a host of conspiracy theories, from raising false questions about Ted Cruz's father being tied to President John F. Kennedy's death to repeatedly questioning President Barack Obama's birth certificate to besmirching Muslims by suggesting they were cheering in New Jersey on September 11.
Blankenship, who was also making final campaign appearances on Tuesday, predicted during his own appearance on "Talkline" today that Trump's tweet won't have a major impact.
He has particularly targeted Republican Senate leader Mitch McConnell, claiming he is a "swamp captain" who has "given millions of jobs to China people". He also is running television ads targeting the Taiwanese heritage of McConnell's wife, U.S. Transportation Secretary Elaine Chao.
In an interview with Roll Call last week, Blankenship said his campaign ad was not racist because in the ad "there's no mention of a race".