Larry Craig's getting help from a source he probably didn't expect: the ACLU.

We know that Craig unsuccessfully tried to get his guilty plea revoked, but despite failing that, has decided to serve out his term, which ends in 2009.

On Tuesday the ACLU filed a brief citing a Minnesota Supreme Court ruling 38 years ago that found that people who have sex in closed stalls in public restrooms "have a reasonable expectation of privacy."

Okaaaay.

The brief also said, "The government cannot prove beyond a reasonable doubt that Senator Craig was inviting the undercover officer to engage in anything other than sexual intimacy that would not have called attention to itself in a closed stall in the public restroom."

Uh-huh.