This will surprise no one, but I’ll mention it anyway.

The Texas Panhandle — the unofficial Ground Zero of the state’s Republican Party — is full of voters who are going to cast their ballots for Donald J. Trump for president of the United States in just 41 days.

I know a few of them. They’re friends of mine.

One of them sought to spin their guy’s miserable debate performance last night this way: “Hillary Clinton clearly is an accomplished debater. Trump? Well, he’s not.”

So, there you have it. Clinton’s debating skills won the day over Trump.

I told my friend that the issue wasn’t just debate experience. It was, indeed, that knowledge and preparation are essential for anyone who seeks to become commander in chief, head of state and president of the greatest country on Earth.

Trump was profoundly unprepared to deal with Clinton’s knowledge. That he spun off into those ridiculous riffs about President Obama’s place of birth and his attack on a former Miss Universe only proved beyond a doubt that this guy does not have the focus, discipline and — intellectual stamina — to compete head-to-head with the former secretary of state.

The most graphic irony of the 90-minute encounter last night to my eyes and ears clearly was that the candidate whose “stamina” has been questioned by Trump and the Republicans was the one who maintained her cool and composure.

Donald Trump was the one who ran out of gas in the final 15 minutes. His incoherence was quite startling.

Did this debate change any minds among voters? Oh, probably not. As my wife noted, Trump has been saying these outrageous things all along, but those GOP primary voters keep hanging with the Republican nominee.

Trump is now blaming the microphone and the “unfair” questions posed by moderator Lester Holt of NBC News for his utterly miserable performance in front of tens of millions of Americans.

Oh, boy.