Let’s say you’re running underdog Democratic presidential candidate Martin O’Malley’s Super PAC. What’s the first order of business?

Could it be: Convincing voters he has a shot? Trying to chip away at the Hillary Clinton colossus?

Well, in the mixed-up world of presidential politics, where it’s sometimes not entirely clear whether candidates are running for president or jockeying for the vice presidential nod, O’Malley’s Super PAC on Thursday released an ad slamming not Hillary Clinton — but fellow underdog Bernie Sanders.

The ad, released by O’Malley’s Super PAC, Generation Forward, is one of the first ads released on behalf of O’Malley’s campaign. It labels Sanders “no progressive when it comes to guns.” The commercial flashes headlines from online news articles calling Sanders a “gun nut.” In a message about the anti-Sanders ad, the pro-O’Malley PAC explained on Facebook, “You can’t claim to soak the fat boys and exempt the profiteers in the gun industry.”

As the Boston Globe recently reported, Sanders “has amassed a mixed record” on gun issues, voting against the landmark Brady gun control bill but voting in support of a ban on assault weapons in the aftermath of the Sandy Hook school shooting. As the Globe noted, activists have found that Sanders has shown little interest in gun-related legislation.

Watch the commercial here.

