More than a dozen recent cases of criminal charges or investigations against elected officials, including a rash of arrests in just the past couple of days, have one major thing in common.

They're all Democrats, and, in many instances, establishment media seems loath to report that fact.

On his nationally syndicated radio show today, Rush Limbaugh recounted a number of the cases, including the gun-trafficking charges brought today against California state Sen. Leland Yee.

Limbaugh pointed out that Yee "was among the most vocal anti-Second Amendment Democrats in the country."

"This guy wanted to eliminate it. He didn't want you to have any guns, and here he is indicted for trafficking in military grade weapons," Limbaugh said.

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Limbaugh recalled that in 2011, Yee unsuccessfully tried to organize a boycott of his show after he mocked the president of China.

Yee is the third Democratic California state senator recently tied to corruption charges. Earlier this year, Ron Calderon was indicted for bribery and Roderick Wright was convicted of perjury and voter fraud.

"Folks, the FBI is up to something," said Limbaugh. "The FBI is raiding and arresting Democrats all over this country. You know, it's incredible."

The new Democratic mayor of Charlotte, N.C., Patrick Cannon, was arrested Wednesday by the FBI and accused of accepting tens of thousands of dollars in bribes.

A historian told the Charlotte Observer that "such corruption charges are unprecedented in the city's history." The paper described the FBI investigation into Cannon's activities as "an 'American Hustle'-type operation."

Cannon faces up to 50 years in prison and $1.5 million in fines if convicted on all charges.

Ray Nagin, the controversial mayor of New Orleans during Hurricane Katrina, was recently found guilty on 20 counts of accepting bribes and other charges.

Other former Democratic mayors charged with or convicted of serious crimes include Tony Mack of Trenton, N.J.; San Diego's Bob Filner, Kwame Kilpatrick of Detroit and Larry Langford of Birmingham, Ala.

Meanwhile, the offices of Democratic New York state Assemblyman William Scarborough were raided Wednesday, and Democratic state Sens. John Sampson and Malcolm Smith were indicted on federal corruption charges.

In Rhode Island, House Speaker Gordon Fox resigned after his office was raided this week as part of a joint investigation of the IRS, the FBI, the U.S. attorney's office and state police.

Busy FBI

Limbaugh said he was fascinated by "all this FBI stuff."

"These investigations that they've been engaged in have been going on for years," he observed.

"It's like they've been doing this for years under the cover of darkness and everything else in a way that is perhaps saving the country."

Limbaugh speculated that the Democratic Party itself was behind this rash of stings in order to "take out all their bad apples before the next election."

He asked: "It really is hard to believe that the FBI would be working against the wishes of the [Obama] regime, isn't it?"

The radio host played an audio montage of establishment reports on the arrests in which none of the reporters mentioned that the accused were members of the Democratic Party.