According to the White House visitor's log, ACORN CEO Bertha Lewis visited President Obama's residence one week before the sting videos were released. There is no record of her returning since that date.
Big Government reported:
You can scroll through the list of records on the White House site OR you can download the raw data. Interestingly, the full download uncovers almost 30,000 records, including many from outside the mid-September time-frame detailed on the White House site. In other words, only the records from the specific two week time period are viewable on the White House site. Many other visitor records were released today…they are just much harder to find.
Like, for example, the visitor records for Bertha Lewis.