Here is John Lott's newest piece at Investor's Business Daily: No doubt, former New York City Mayor Michael Bloomberg passionately believes in gun control. To his credit, he puts his own money — tens of millions of dollars, and possibly much more — into pushing the issue politically. But Bloomberg's push hasn't been just political advertising, lobbying and media appearances. He also funds studies that have gone overboard in backing up his anti-gun beliefs. To put it plainly, they have not only exaggerated their conclusions but have fabricated numbers. And these incorrect numbers have then been used to push for more regulations. The connections to Bloomberg are not always obvious, as he has funded several organizations, making it look like there is more widespread support. There are Johns Hopkins' Bloomberg School of Public Health and two organizations of which he is the primary financial supporter though they are not directly connected to his name: Mayors Agains...