Demand A Plan PSA: Bloomberg-Backed Groups Debuts Star-Studded, Trenchant Call To Action [VIDEO]

One week after the massacre at Sandy Hook Elementary school, as the nation paused to remember the lives that were lost, the "Demand A Plan" initiative --backed by Mayors Against Illegal Guns and New York's Michael Bloomberg -- released a public service announcement urging Americans to demand stronger gun-control legislation.

The video also features Hollywood talent, including Chris Rock, Julianne Moore, John Hamm, Beyonce, Jeremy Renner, Jessica Alba, Will Ferrell, among others. The video asks Americans how many more mass shootings following Aurora, Oak Creek, and Newtown have to occur before legislators address gun violence.

"Enough," the cavalcade of celebrities wailed. "Demand a plan … No more lists … It's time for our leads to act."

After a spate of police shootings in New York, and the recent incident at Sandy Hook Elementary, Mayor Bloomberg has made it his calling to press politicians on gun violence.

According to the New York Times, the mayor plans to spend millions of dollars over the next two years to aid political candidates opposed to the gun lobby. In addition to reaching out to conservative legislators, Bloomberg has had conversations with the White House about Vice President Joe Biden's presidential task force on guns.

“President Obama rightly sent his heartfelt condolences to the families in Newtown,” Bloomberg said in a statement following last Friday's shooting. He added, “What we have not seen is leadership — not from the White House and not from Congress.”

In the 2012 congressional elections, Bloomberg used a portions of his estimated $25 million fortune and his newly-formed Super PAC to inject millions into the campaign of Scott Brown (R-Mass.), who opposed an NRA-sponsered bill, and against Joe Baca (D-Calif.), a pro-gun Democrat.

“If you told me that I could write a check today and stop 48,000 murders in America in the next four years, can you imagine me not? Bloomberg said. “What kind of a person would I be?”