What the $?&(! is going on with our politicians?

The mayors of New York and Philadelphia and the governor of New Jersey let loose with a few choice vulgarities over the past two weeks in otherwise G-rated public settings, including a town-hall meeting and a City Hall event.

And all three men knew full well the microphone was on.

While foul language has been uttered in politics before, the blue streak is making some wonder whether it reflects the coarsening effects of pop culture in this reality-TV era of “Jersey Shore” and “The Real Housewives,” a decline in public discourse, a desire by politicians to come across as average Joes, or just a really hot summer.

First there was famously blunt New Jersey Gov. Chris Christie branding a lawmaker “one arrogant S.O.B.” at a town hall last month (and using some stronger epithets in discussing his passion for the music, though not the politics, of Bruce Springsteen in an interview published in The Atlantic this month.)

Then New York Mayor Michael Bloomberg, apparently having trouble stomaching a slew of puns in his prepared remarks for Tuesday’s contestant weigh-in at City Hall before the Fourth of July hot dog-eating contest, chuckled, “Who wrote this s—?” to guffaws from the crowd.

Then it was Philadelphia Mayor Michael Nutter’s turn on Thursday at a news conference at which he discussed a shooting a few blocks from the center of the city’s July Fourth celebration. He said he wasn’t going to let the city’s image be harmed by “some little ass—- 16-year-old.”

“My sense is: Because they want to appear to be in tune with popular culture, politicians feel free to express themselves in profane ways,” said Rutgers University political scientist Ross K. Baker. And he finds that troubling: “I honestly do believe that, in aping the coarseness of popular culture, people in public life are really dragging us into a discourse of fang and claw.”

President Harry S. Truman was criticized for his use of such salty language — for his time — as “hell” and “damn.” And many Americans were shocked by Richard Nixon’s liberal use of profanities on the Watergate tapes, which made “expletive deleted” a pop-culture catchphrase.