Yes.
The Republican presidential candidate has won the majority of votes in all 77 counties in Oklahoma in the six presidential elections since 2004.
The last counties to vote majority Democrat were Cherokee, Choctaw, Haskell, Hughes, McIntosh, Muskogee, Okmulgee, and Ottawa counties in the 2000 election between George W. Bush and Al Gore. Oklahoma still voted Republican that year with 60% of the votes.
Since then, Republican presidential candidates have won the majority of votes in Oklahoma with a margin of 60% or more.
The only instances in which Oklahoma voted Republican with margins less than 50% in the last half century were during the 1992 and 1996 presidential campaigns of Bill Clinton.
The last time Oklahoma voted Democratic was in 1964 for Lyndon B. Johnson.
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