The ads you are referring to are from "Americans for a Conservative Direction". These ads are paid for on the local station-by-station level. This PAC is backed by Mark Zuckerberg, the Facebook founder, and are nothing more than liberal subterfuge.
I think running those ads opposite talk radio hosts blasting Rubio and the "conservative" option on immigration that those ads are pimping is having an unintended effect of angering people who understand the issue. Sure the Sean Hannity cluless, useless, Republabots might be taken in but for the rest of us it's just irratating.
Vdare has criticized Rush for taking the money for those ads but let them waste it on a deaf audience.