Don't confuse political showboating with inquiry. Franken seems unaware that all of the information was deposed to Congress in July last year.
I am amused at your faith in politicians.
Turn off anti-Apple bleating, engage brain. Read. Learn:
"When a customer requests current location information ... Apple will retrieve known locations for nearby cell towers and Wi-Fi access points from its proprietary database and transmit the data back to the device" ... "The device uses the information, along with GPS coordinates (if available), to determine its actual location. Information about the device's location is not transmitted to Apple, Skyhook or Google. Nor is it transmitted to any third-party application provider, unless the customer expressly consents".
In the FC thread you already been pointed to the Levinson blog where he explains how he documented this months ago.
Apple's deposition is here:
http://www.wired.com/images_blogs/gadgetlab/2011/04/...
But why do research when you can idly speculate.