A news article and photo cutline in Thursday's New York Times refer to Ohio as "a deep-red state that Mr. Trump won in the 2016 and 2020 elections."
It's true that Ohio has been trending more Republican lately, but to call it "deep red" is probably an overstatement. The state still has a Democratic U.S. senator, Sherrod Brown. An October 2021 report from the Ohio Secretary of State on party affiliation data in the state's voter registration database found 947,027 registered Democrats and 836,080 registered Republicans, meaning that Democrats have a voter registration edge in the state. An April 2020 statewide poll by Baldwin Wallace University's Ohio Poll found more Democrats than Republicans, both before and after weighting.
It's a good example of politics being in the perception of the beholder. If you are a reporter for the New York Times writing for readers in San Francisco, New York, Boston, and Washington, D.C., Ohio looks "deep red." If you come from somewhere that is actually really deep red, like Wyoming or South Dakota or Utah, Ohio looks like a place where Democrats have an advantage, or that is maybe mildly red when it comes to presidential choices, but is not accurately described as "deep red."