Obsessed by the presidential rectangle problem, I fiddled with it during bouts of insomnia with the following results: a perfect 396-cell rectangle and a defective 391-cell one (BUSH disconnected). A perfect 391-cell specimen may be possible - surely the ultimate?
"The Ultimate Presidential Rectangle?,"
Word Ways: Vol. 27
, Article 18.
Available at: http://digitalcommons.butler.edu/wordways/vol27/iss1/18