Barack Obama currently has an approval rating of 43%, and has varied as high as 69%...and he was elected by the mainstream voting pool.
Jailbreaking started two weeks after the release of the original iPhone, and was driven mainly by the carrier restriction in the United States. I purchased my iPad 2 on March 11, 2011 and was not able to jailbreak it until July 5, 2011 with the launch of JailbreakMe 3.0.
During a Saurik Q&A, it was revealed that around 12% of Apple iPad/iPhone devices are jailbroken. But this number drops to 6% after a major iOS update, leading many to suspect that many have installed iOS 5 without a jailbreak.
With the lacking support for the iPhone 4S and iPad 2 in iOS 5, these percentages are sure to drop until the jailbreak developers can find a way to get Cydia installed.