No, it is not correct to say that Oklahoma Senator Markwayne Mullin is living from his couch. The statement appears to be a typographical error or a misstatement in a headline or article. As a member of the United States Senate, Senator Mullin has an office and staff in both Washington, D.C., and Oklahoma. It is highly unlikely that a senator would live on a couch, as they require a residence to carry out their duties and represent their constituents. The statement may have been intended to mean something else, but without further context, it is unclear what the author intended to convey. It is always important to verify the accuracy of statements, particularly when they seem unusual or implausible.