Toilet trolling Senator Larry Craig has a friend in the ACLU:

In an effort to help Sen. Larry Craig, the American Civil Liberties Union is arguing that people who have sex in public bathrooms have an expectation of privacy.
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The ACLU filed a brief Tuesday supporting Craig. It cited 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."

That means the state cannot prove Craig was inviting an undercover officer to have sex in public, the ACLU wrote.
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The ACLU argued that even if Craig was inviting the officer to have sex, his actions wouldn't be illegal.

"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," the ACLU wrote in its brief.

The ACLU also noted that Craig was originally charged with interference with privacy, which it said was an admission by the state that people in the bathroom stall expect privacy.

Craig resurrected his case earlier this month. Apparently he's a masochist, which makes sense.