Yazel, seeking his third term, has disagreed with fellow county officials over open government issues.
In March, Yazel cast the dissenting vote when the Tulsa County Budget Board voted to require its members to complete a public records request form when they request information related to their meetings.
He also opposed a bill that would have allowed county commissioners to employ the same top aide. Yazel said the bill would open the door for scandal and likely lead to violations of the Open Meeting Act.
FOI Oklahoma began the Open Government Pledge in spring 2008 as part of a national effort to spur public commitments to government transparency from candidates for president down to city council contests.
Signers are listed on the FOI Oklahoma Web site, where the pledge form is available for download.