As feeble as it is.
It wasn't 5th District Congressman Tom Perriello's office that called the police and had tea party protesters removed from in front of Perriello's office. It was ... someone else ... who didn't like the idea that tea party protesters were in front of Perriello's office.
Why anyone ... else ... would be concerned about protesters being in front of Perriello's office remains a mystery.
See the exhaustive - and too-shrill-by-half - excuse-making here. And here.
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This can be easily resolved, by the way. Calls to the police on emergency communications lines (9-1-1) are a matter of public record. Charlottesville police should reveal the name of that individual who called and lodged the complaint.