In radio and billboard ads across the country, the federal government is telling potential gun buyers "don't lie for the other guy." The campaign message is intended to stop those with clean criminal records from buying firearms for felons who legally can't buy guns on their own. 

The message underscores the full-court press in Washington to adopt sweeping new gun control laws, from universal background checks to a ban on military-style rifles and large ammunition magazines. 

However, recent studies show the Obama administration has not enforced many gun laws already on books -- with gun crime prosecutions hitting a decade low in 2011, down 40 percent from their peak under President George W. Bush in 2004, according to federal data crunched by Syracuse University. The SU study prompted 23 House Republicans on Friday to call on President Obama and Attorney General Eric Holder to prosecute more people for gun-related crimes.