That's saying a lot, because the Nevada Democrat has had a reputation for being one of the dirtiest politicians in the sleaze- slinging business.
In an interview with the Huffington Post the other day, Reid charged that an unnamed investor at Bain Capital, the business investment company Mitt Romney founded, told him that Romney hadn't paid any federal taxes for at least a decade.
"He didn't pay taxes for 10 years," Reid stated flatly. "Now, do I know that's true? Well, I'm not certain," he said.
The incendiary charge, without an iota of proof to back it up, was bad enough, but he repeated it on the Senate floor where lawmakers can make all the false accusations they want and are Constitutionally protected from the libel laws.
Reid, apparently, believes he can make any claim he wants about Romney and get away with it. In this case, he was doing the dirty work in the midst of a very hard-fought campaign in which President Obama is in a dead heat with his well-funded Republican rival and could end up on the ash heap of failed, one term presidents.
Reid didn't just toss the charge out there and leave it at that.
No, he rubbed it in as if it were gospel truth. He had it on good authority, he said, though he isn't saying who that person is -- if in fact anyone really told him this.
"I mean, you do pretty well if you don't pay taxes for 10 years when you're making millions and millions of dollars," Reid said in the interview.
Later, he felt the need to elaborate further on what The Washington Post described as "Mr. Reid's unseemly drive-by" attack, saying that "a number of people tell me that."
This is the worst kind of smear politics possible, making unsubstantiated accusations against the political leader of the opposing party, charging that he was a tax dodger.
Reid has shamelessly produced no evidence to support his charges.
He knows the way the game is played. All you have to do is hurl an outrages accusation against Obama's opponent, knowing that there are people out there who will believe it.
"If the senator has any proof, he owes it to Mr. Romney, the presumptive Republican presidential nominee, to put it on the record, now," the Post said in a blistering editorial Wednesday.