Via Politico:

The anti-illegal guns group founded by New York City Mayor Mike Bloomberg is going on air tomorrow with a spot that invokes the Sandy Hook massacre and features the mother of the young girl slain in the Tuscon, Ariz., rampage two years ago urging Washington to “stand up to the gun lobby.”

The ad, paid for by the Mayors Against Illegal Guns, will go on broadcast television for a single-day buy on the two-year anniversary of the Tuscon shooting, which nearly claimed the life of former Rep. Gabrielle Giffords.