Bloomberg group attacks Rubio on guns

The group, Mayors Against Illegal Guns, is running ads in Rubio's home state of Florida, targeting him for vowing to filibuster any bills related to gun control. The ad accuses Rubio of running to the right to further his presidential ambitions.

"Marco Rubio: A new senator, but already looking past Florida, thinking of running for president. And that has Rubio running to the right, opposing a bill on comprehensive background checks," the ad's narrator says in the ad, which includes an animated Rubio. "Rubio would let criminals and the dangerously mentally ill get guns without a background check. Even worse, Rubio has said he would filibuster the vote in Washington – so the Senate won’t even be able to vote on background checks."

The group is running the ads on broadcast television in the Tampa and Orlando media markets, two of the state's largest.

Rubio has signed on to a letter backed by more than a dozen conservative Republican senators that promises to oppose a vote on any gun measures — something other Republicans have disagreed on, arguing they should be able to bring the bill to a vote. A new background check proposal by Sens. Pat Toomey (R-Pa.) and Joe Manchin (D-W.Va.) may change the calculus on the issue, however.

Rubio's political action committee is already using the ad to fundraise from supporters.

"We knew the liberals hated Marco's message of economic empowerment and limited government, but now they've really stepped up their attacks. This morning, big government liberals have begun airing TV ads in Florida attacking Marco," Terry Sullivan, the head of Rubio's Reclaim America PAC, emailed to supporters before asking for donations.