One measure of a savvy politician is how he handles his mistakes. Expressing nostalgia for the days when one could shoot or stab a critic is not a great PR move.

Rand Paul, the Republican U.S. senator from Kentucky who has been accused of serial plagiarism, is melting under the heat.

The freshman senator, beloved by the tea party and touted as a potential 2016 GOP presidential candidate, has lashed out at the reporters who have discovered his borrowings, calling them "hacks and haters."

MSNBC’s Rachel Maddow noted last week that Paul lifted language from the Wikipedia entry on the sci-fi movie "Gattaca" for a speech he gave in Virginia at the end of October.

“Nothing I said was not given attribution to where it came from,” Paul told Fusion's Jorge Ramos. “I talked about a movie. … The rest of it’s making a mountain out of a molehill from people I think basically who are political enemies and have an ax to grind.

"It’s a disagreement on how you footnote things.”

Some have questioned whether stealing from Wikipedia really constitutes plagiarism, but Wikipedia itself is pretty clear on the subject: It’s not OK.

Other reporters, notably Buzzfeed’s Andrew Kaczynski, have analyzed Paul’s speeches, books and newspaper columns and have come up with a number of instances where the senator has lifted material from other sources, including think-tank reports and magazines.

A spokesman for one of the think tanks, the Heritage Foundation, told Buzzfeed it did not object. After all, the foundation is in the business of supplying conservative lawmakers with intellectual ammunition. But just because your victim doesn’t press charges doesn’t mean you haven’t done something wrong.

This week, the fallout began.

On Wednesday night, the Louisville Courier-Journal wondered in a sternly worded editorial, “Rand Paul-agiarism,” whether Paul was “a politician or a parrot.”

A day earlier, the Washington Times announced that it had “mutually agreed” with Paul to drop his weekly column after the paper discovered he lifted a passage from the Week for his Sept. 20 piece  critiquing mandatory minimum sentencing for drug crimes. In its news story announcing the severed relationship, the Washington Times explained:

“Mr. Paul took personal responsibility for the oversights, which he and aides said were caused by staff providing him background materials that were not properly footnoted. But the Kentucky Republican, a possible 2016 White House candidate, also said he was being held by the news media to a higher standard than other politicians.”

The newspaper also noted that Paul told CNN, "They’re now going back and reading every book from cover to cover and looking for places where we footnoted correctly and don’t have quotation marks in the right places or we didn’t indent correctly."

Yup, that’s exactly what “they” do when a prominent national figure is accused of plagiarism. They whip out the old fine-tooth comb.

Sadly, it’s not even news that a politician with presidential aspirations does not even pretend to be the author of the words that come out of his mouth or run below his name. But whether the lifting was intentional does not absolve the senator of responsibility.

Lashing out makes him look uninformed, paranoid and, frankly, not very mature.

“I think I am being unfairly targeted by a bunch of hacks and haters,” he told ABC’s Sunday morning program “This Week.” “And I like to say, you know, if dueling were legal in Kentucky,” he added, “if they keep it up, you know, it would be a duel challenge. But I can’t do that because I can’t hold office in Kentucky then.”

Just what we need: honor killings.