
“If my critics saw me walking over the River Thames they would say it was because I couldn't swim.”
Attributed to her in http://www.telegraph.co.uk/news/features/3637706/Quite-Interesting.html and other sources. Actually an adapted Lyndon Johnson quote "If one morning I walked on top of the water across the Potomac River, the headline that afternoon would read: 'President Can't Swim.'"
Misattributed