The stupid just cannot be contained. Sen. Harry Reid, the Democrat head of the U.S. Senate:

Senate Majority Leader Harry Reid (D-Nev.) has what he says is an informed explanation for why Mitt Romney refuses to release additional tax returns. According a Bain investor, Reid charged, Romney didn't pay any taxes for 10 years.

In a wide-ranging interview with The Huffington Post from his office on Capitol Hill, Reid saved some of his toughest words for the presumptive Republican presidential nominee. Romney couldn't make it through a Senate confirmation process as a mere Cabinet nominee, the majority leader insisted, owing to the opaqueness of his personal finances.

"His poor father must be so embarrassed about his son," Reid said, in reference to George Romney's standard-setting decision to turn over 12 years of tax returns when he ran for president in the late 1960s.

Saying he had "no problem with somebody being really, really wealthy," Reid sat up in his chair a bit before stirring the pot further. A month or so ago, he said, a person who had invested with Bain Capital called his office.

"Harry, he didn't pay any taxes for 10 years," Reid recounted the person as saying.

"He didn't pay taxes for 10 years! Now, do I know that that's true? Well, I'm not certain," said Reid. "But obviously he can't release those tax returns. How would it look?

Really? How does some Bain investor know what was in Romney's tax returns? One who just happened to call Reid on a lark to reveal all about Romney's dark secret.

Reid's making ABC News reporter Brian Ross look like a responsible adult.

Someone took a few too many blows to the head as an amateur boxer.

It'll be interesting to see if the Obama campaign is desperate enough to repeat Sen. Reid's delusions. Despite their increasingly insistent campaign e-mails, I doubt they're that stupid.