It's the first look at the governor's race since Tuesday's primary.
Fallin had 57 percent of the vote, compared to Askins' 36 percent.
Fallin defeated State Senator Randy Brogdon and Oklahoma City businessmen Roger L. Jackson and Robert Hubbard in Tuesday's primary.
It was a much tighter race on the Democratic side. Askins edged out Attorney General Drew Edmondson.
Askins and Fallin will face off in the general election in November.