Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page USS Potomac (AG-25):

"

In the meantime and for security purposes, the President's flag continued to be flown from Potomac while she transited the Cape Cod Canal in New England waters. A Secret Serviceman, approximating the President in size and affecting his mannerisms when visible from a distance, played a starring role in the deception. Press releases issued daily from Potomac led all who read them to believe that the President was really embarked in his yacht on a pleasure cruise. After the meetings, Augusta returned the President to Potomac on 14 August.