A new national campaign will seek to repeal "Stand Your Ground" laws across the country -- including Florida.

New York City Mayor Michael Bloomberg announced Wednesday a campaign called "Second Chance on Shoot First." The goal is to repeal or revise the laws in the 25 states where they currently exist.

The state attorney originally said that George Zimmerman could not be arrested for the shooting death of Trayvon Martin in-part because of Florida's Stand Your Ground law, which was signed in 2005 by Governor Jeb Bush. Bloomberg says it was drafted by the National Rifle Association.

Bloomberg's group, which is supported by several high-profile civil rights leaders, including Rev. Al Sharpton, said Wednesday that Florida's justifiable homicide cases had risen from 12-per-year to 36-per-year after the passage of Stand Your Ground.

Bloomberg also is working with incoming Florida Senate Minority Leader Chris Smith, D-Fort Lauderdale. Smith has started a task force to review or repeal Florida's own law, saying it is "misunderstood and misused." Smith has also started a website for the taskforce, and is asking for the public's input on the law.

Bloomberg has made gun control and getting guns off the streets a top priority.