Tell me what activist groups would even know what to look for let alone how to file a complaint that would get the FCC to the station's door any quicker than they would otherwise.
It's largely anonymous here, but your question suggests that you're not a licensee.
Admittedly-dated-reference, circa 80s, when I was at WTOP: National Black Media Coalition president Pluria Marshall was quoted in trade press, responding to suggestions that his-group's-doing-so was "Abuse of Process." Reminding that the public owns the airwaves, he characterized it as "USE of process."
Don't blame Mitt Romney if he hardly pays any taxes.
He's simply playing-by THOSE rules.
The Rules are The Rules.
Wouldn't Rush's comments likely fall under the personal attack rules?
Personal Attacks. Personal attacks occur when, during the presentation of views on a
controversial issue of public importance, someone attacks the honesty, character, integrity,
or like personal qualities of an identified person or group. No more than a week after a
personal attack, the station must transmit the following three things to the person or group
attacked: (1) notification of the date, time, and identification of the broadcast; (2) a tape,
script or accurate summary of the attack; and (3) an offer of a reasonable opportunity to
respond on the air.http://transition.fcc.gov/Bureaus/Mass_Media/Factsheets/pubbroad.pdf
on page 9.
I don't know how this applies to individual stations when it originated from a network source.