It may just be a timing thing, but the article states...
Scott Levenson, a spokesman at ACORN's national offices said, "The portrayal is false and defamatory and an attempt at 'gotcha journalism.'
"This film crew tried to pull this sham at other offices and failed. ACORN wants to see the full video before commenting further," Levenson said.
The conservative filmmakers unsuccessfully attempted similar ruses at the group's offices in Philadelphia, Pennsylvania, Los Angeles, California, and New York, Levenson said.
and yet......
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So, clearly, the comment that "This film crew tried to pull this sham at other offices and failed" appears at best incorrect and at worst an outright lie, and the point that was made that "The conservative filmmakers unsuccessfully attempted similar ruses at the group's offices in Philadelphia, Pennsylvania, Los Angeles, California, and New York, " appears to be at best cherry picking, at worst another lie.
It's not hard to find articles that cover the other cities such as this one...
ACORN Employees caught at Brooklyn office helping hookers launder earnings
...though this was admittedly a few days after so it may be, like I said, a timing thing.