When will some Democrats who describe themselves as “pro-gun” realize that they aren't fooling anyone? 

Here's their latest deception. President Obama’s nomination of Dr. Vivek Murthy to be surgeon general is in trouble, because the National Rifle Association decided that it was going to “score” the vote – that is, let its members know which senators voted for someone they believe is a threat to people being able to own guns for self-defense. 

The New York Times reported late Friday: “Three Democratic Senate aides with knowledge of where members stood on the nomination said Friday that enough Democrats could oppose Dr. Murthy that he would most likely fail to be confirmed if a vote were held soon.”

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Not wanting to put Democratic senators from conservative states in a difficult position, word started leaking out late Monday that Democrats want to delay the vote until after the midterm elections in November. 

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Democrats apparently believe that, with their re-election behind them, they will then be safe to vote to confirm Murthy. 

Voters have seen these games by “pro-gun” Democrats before. In 2009, when the Senate voted on states recognizing other states’ concealed handgun permits, just as states recognize other states’ driver’s licenses, Sen. Mark Pryor (D-Ark.) voted against the measure until it was clear that there were sufficient votes to kill it. 

The Washington Post described Pryor’s actions this way: “[Sen. Chuck Schumer (D-NY)] gave Pryor a nod, and the Arkansan -- reassured that his vote was not needed to defeat the proposal -- changed his vote to an ‘aye.’”

Also in 2009, NPR reported how “pro-gun” Senate Democrats privately complained about being forced to vote for bills ranging from letting law-abiding visitors carry legal firearms into national parks to forbidding the District of Columbia from restricting gun ownership. 

Earlier this year, four “pro-gun” Democrats on the Senate Homeland Security Committee voted against a Rand Paul amendment ending the gun-free zones in post offices. In that case, Jon Tester (D-Mont.), Mark Begich (D-Ark.) and Heidi Heitkamp (D-N.D.) joined Pryor. 

By contrast, all the Republicans voted to support ending gun-free zones at post offices and all the Democrats voted to keep them. Even John McCain (R-Ariz.), who has worked with gun control groups on gun show regulations and gunlocks, voted to finally end these gun-free zones. 

In Murthy’s case, there are good reasons why the NRA strongly opposes his nomination. He has advocated that physicians question parents about their gun ownership and counsel them not to own guns or always to store them locked up. 

He has even gone so far as to advocate “documenting gun ownership” by patients. 

If physicians record this information and report it via electronic medical records to the government, it is simply another way of registering guns. 

If Murthy really worried about children's safety, his time would be better spent advocating that doctors ask patients about other, greater dangers lurking around the children’s and their playmates' homes: a swimming pool, chemicals and medications, bathtubs, water buckets, bicycles, cars and items that can cause suffocation. 

Accidental gun deaths involving children are especially horrible, but they are fortunately rare. Take the last five years for which the Centers for Disease Control data are available, 2006 to 2010. 

On average there were 33 accidental gun deaths per year for children under 10. Including children under 15 raises the number to 58. 

Research done on cases before the CDC privacy restrictions found that most cases for those under 10 involved adults firing the gun, not children getting a hold of their parent's guns. 

The real risk factor isn't whether people residing in these homes own guns, but whether violent felons live there. 

Over the same five years for children under 15, accidental suffocations alone averaged 1,162 deaths per year; drownings 736; 376 children died from fires; 106 died from poisonings; 84 died from accidents while riding bicycles. For children under age 5, 70 a year drown in bathtubs.

Even worse, states that have mandated that people lock up their guns didn’t see a reduction in accidental gun deaths or suicides for children or teenagers. Instead, as guns became less accessible for self-defense, criminals became more emboldened to attack people in their homes and their crimes were more successful. 

“Pro-gun” Democratic Senators should have the courage of their convictions. 

Putting off Murthy’s confirmation vote until after the 2014 midterm elections should simply be taken as evidence that some of these “pro-gun” Democrats will still vote to confirm him.

John R. Lott, Jr. is a columnist for FoxNews.com. He is an economist and was formerly chief economist at the United States Sentencing Commission. Lott is also a leading expert on guns and op-eds on that issue are done in conjunction with the Crime Prevention Research Center. He is the author of eight books including "More Guns, Less Crime." His latest book is "Dumbing Down the Courts: How Politics Keeps the Smartest Judges Off the Bench" Bascom Hill Publishing Group (September 17, 2013). Follow him on Twitter@johnrlottjr.