Harry Reid may be majority leader of the U.S. Senate, but that's just his day job. His real calling, his true vocation, the arena in which he seems most his lowdown self, is that of ax man. And he's got a real talent for it. By now there are few tricks of that dirty trade he hasn't mastered. Senator Reid seems to enjoy the seamy side of politics so much it's hard to envision him being anything but the crass pol he is, long has been, and probably always will be.

Yes, the possibility of redemption is eternal, but odds are odds. And who better to live by the odds than a U.S. senator from Nevada, epicenter of the country's gambling industry? And the odds are long against Harry Reid's suddenly turning into a knight in shining armor; his whole record demonstrates his preference for the cheap shot, the low rumor, and transparent dodge. And why not? In his case, it's paid such political dividends - from his tenure in the Senate to national prominence.

The man is a case study in how to rise in politics by sinking ever lower. He may lack Richard Nixon's all-time record for general shadiness, but the senior senator from Nevada will do for this era, or at least until an even dirtier politician becomes a mainstay of the news.

The way Harry Reid has played this game indicates he's going to be a lifetime recidivist where the art of the smear is concerned. Maybe he just can't help himself, he enjoys the sport so much. We hear tell there are folks who love mud-rasslin', too.

Harry's latest class act is to say he's been told that that Mitt Romney, the GOP's presidential nominee-to-be, didn't pay any income taxes for 10 years.

Who told the senator so? That the senator refuses to say. Where's his proof? He doesn't need any, this being an American presidential election. When pressed by Mr. Romney ("Put up or shut up"), Senator Reid challenges Mitt Romney to disprove his allegation. He only makes the accusations; it's up to the accused to disprove them.

The spirit of Joe McCarthy yet lives - and once again prowls the halls of the U.S. Senate. Thanks to Harry Reid and others, politics has become more like character assassination. And now it's Mitt Romney's character that's in the bull's-eye. It comes with the territory known as an American presidential election. There's no telling what you'll hear about Barack Obama, either, that Kenyan Muslim.

Still, you have to admire the twist Harry Reid has given his latest smear job.

He says the rumor about Mr. Romney and his taxes came not from just a "credible" source, but an "extremely credible source." Also an extremely anonymous one, but no matter. Pay no attention to that man behind the curtain - if there is one.

It's all part of a not so-grand American tradition that goes back to the presidential election of 1800, when both Thomas Jefferson and John Adams attracted the support of smear artists eager to tar the other. Now no presidential election would be complete without a flurry of ill-founded accusations.

When cornered, the accuser can just repeat the charge, or even elaborate on it. By now Senator Reid may have claimed he has other sources for his allegation, too. It will surprise no one to learn that they, too, are anonymous. It's good to see American traditions continued. But not this one.

Naturally, the senator has consistently declined to release his own income tax returns over the years. That's only for lesser creatures, like Republican presidential candidates.

This is a game anyone can play. For instance, we've been told - and by an extremely credible source, too - that Senator Reid closely coordinated this smear with Barack Obama and the rest of the bunch now occupying the White House. If the senator denies it, it would be easy enough to resolve the matter: Just have him release his records of every communication, contact or even near-contact with all the president's men - and women, too. Just as he's said that all Mitt Romney has to do to clear up this matter of his income taxes is release the last five, ten, or maybe 20 years of his tax records. (What, not his father's, too?) Let the senator from the casino state also prove that he's stopped beating his wife.

There. See how easy this is? All it takes is a little imagination and unlimited nerve.